This article is about episodes of the anime Sister Princess, divided into the two seasons. Since ADV only has the license for the first season, the English titles below for the first season are those officially given by ADV; those of the second season are just approximate translations taken from here.

Sister Princess (1st season)

# Episode Name Original air date
01 My Graduation
"Boku no Guradyuēshon" (僕のグラデュエーション)
April 4, 2001 {{{FirstEngAirDate}}}
Wataru is in a depressed mood after failing to pass a high school entrance exam because of a computer glitch. He is then unexpectedly and without explanation whisked off to Promised Island, where he meets four girls who turn out to be his younger sisters.
02 I Love Big Brother So Much!
"Onii-chan, Daisuki!" (お兄ちゃん, 大好き!)
April 11, 2001 {{{FirstEngAirDate}}}
A chain of initially unexplained events leads Wataru to meet his eight other sisters. All twelve are gathered together when Mami, a girl who is following him, is spotted and she lies and says she is his sister too, making Wataru think he has 13 younger sisters!
03 Together With Dear Brother
"Onii-sama to Issho" (お兄様といっしょ)
April 18, 2001 {{{FirstEngAirDate}}}
Wataru and his sisters go on their first day of school, but Wataru is feeling the pressure to watch over them. Everywhere he goes at least one of his sisters follows him wanting attention, and Wataru starts to feel overloaded. So he tries to leave the island. And fails. Karen comes and convinces him to stay, and they go back to their house together. Meanwhile, Wataru's occult sister is looking into her crystal ball, and says quietly to herself that there's danger in Wataru's future.....
04 Where's Mr. Teddy Bear?
"Kuma-san, doko?" (くまさんどこ?)
April 25, 2001 {{{FirstEngAirDate}}}
Wataru helps Hinako, his youngest sister, search for a teddy bear that she saw in a dream she had. They go all around town in every store but can't find the exact right bear. They finally give up, but Hinako says it's okay as long as she has her big brother around. Just then an 'old jogger' (the butler in disguise again) comes and gives them a package that Wataru 'dropped' (again, a blatant lie, it being the size of a person). Hinako opens it, and inside is her perfect bear!
05 E-mailing with Bro
"Aniki to Mēru" (アニキとメール \(^◇^)/)
May 2, 2001 {{{FirstEngAirDate}}}
The sisters are beginning to be jealous about the numerous e-mail messages Wataru is exchanging, so they each get RinRin (the invention sister) to make them phones that can send e-mail so they can exchange mail with Wataru. Wataru gets frustrated at all the mail overload and about not having much time to himself, but the girls' innocence and cute messages cheer him up.
06 Twelve Gentle Princesses
"Onii-chan wa Ojii-sama" (お兄ちゃんは王子様♥)
May 9, 2001 {{{FirstEngAirDate}}}
Wataru and 11 sisters plus Mami all see a contest to win a special prize and decide to try and win it by putting on a play Yamata wrote called the 12 gentle princesses. Wataru is cast as the prince, and all of the sister plus Mami and minus the occult sister each play the role of a different princess. The play fails epicly and they lose, but they all get consolation prizes.
07 Season of Love
"Koisuru Kisetsu" (恋する季節)
May 16, 2001 {{{FirstEngAirDate}}}
Simple fun with the laundry turned into play wedding dresses as the sisters dress themselves up as brides. It is first hinted in this episode that Wataru will need to make some kind of choice between the 12 girls.
08 One Day Two of Us
"Itsu no Hika Futari de" (いつの日かふたりで)
May 23, 2001 {{{FirstEngAirDate}}}
Wataru spends a day with Marie. Marie, however, becomes sick because of a downpour. Wataru vows to stay with her forever, and after a day or two, Marie is completely better.
09 Summer Has Come
"Natsu ga Kimashita" (夏がきました)
May 30, 2001 {{{FirstEngAirDate}}}
Wataru spends his initial summer days with his sisters. They all go out to buy swimsuits and all the sisters each get one. Everyone, including creepy Yamada, joins in to clean the pool so they can splash around. Later, Wataru admits he doesn't know how to swim and decides to learn how.
10 Do Your Best, Big Bro!
"Gambatte, Anii!" (頑張って, あにぃ!)
June 6, 2001 {{{FirstEngAirDate}}}
Mamoru teaches her Big Bro Wataru how to swim. He almost gives up, but is able to learn the doggy paddle.
11 Secret Tour With Bro
"Aniki to Shīkuretto Tsuā" (アニキとシークレットツアー)
June 13, 2001 {{{FirstEngAirDate}}}
Wataru and his sisters set out in on an underwater tour in a submarine single-handedly constructed by Rin Rin. At first, the ocean is beautiful and everything is great, but a storm comes in and the submarine starts leaking. Wataru tries to patch it up, but he fails and everyone is scattered and ship-wreaked, leaving Wataru and Mami alone.
12 Vacation Is Love
"Bakansu wa Rabu yo" (バカンスはラブよ♥)
June 20, 2001 {{{FirstEngAirDate}}}
All 12 sisters plus Mami and Wataru are ship-wreaked on an unknown island together, where they find a large and well-stocked beach house. They decide to live there while they try to figure out where they are and how to get home, and have some fun while they're at it. RinRin finds and repairs a jet ski, and they all play in the water and on the beach. Everyone is having fun, but Wataru is the only one worried about getting home. When night comes, Wataru finds out that they've actually been on Paradise Island the whole time, just on the other side from where they were living before.
13 Summer With Big Brother
"Onii-chan to no Natsu" (お兄ちゃんとの夏)
June 27, 2001 {{{FirstEngAirDate}}}
Wataru reminisces his time with his sisters so far. Just a recap episode, except for the very, very end where we get a glimpse of the elusive and mysterious little girl in the yellow hat who has appeared in the credits of every episode.
14 True Feelings
"Hontō no Kimochi" (本当のキモチ♥)
July 4, 2001 {{{FirstEngAirDate}}}
Wataru, feeling that he doesn't do enough for everyone, tells the sisters that if they have a request, he will grant it. Karen's request to have a lightbulb changed that illuminates a painting ends up with the two spending their time together.
15 Aria's Ribbon
"Aria nō Ribon" (亞里亞のおリボン)
July 11, 2001 {{{FirstEngAirDate}}}
The wind blows away Aria's ribbon (which her Mon Frère Wataru gave her). She is then accompanied by a strange old man to help her find it. Meanwhile, everyone is drawing something in the town as homework, and as Wataru is looking for something to draw, he notices Aria is gone and goes to look for her. Aria finds her ribbon in a tree and the old man vanishes as Wataru finds Aria. Wataru draws all his little sisters next to the tree, and Aria draws Wataru standing next to the tree with her ribbon tied to a branch.
16 Kaho Will Do Her Best!
"Kaho, Ganbaccahau!" (花穂, がんばっちゃう!)
July 18, 2001 {{{FirstEngAirDate}}}
Kaho continues to fumble on her cheerleading routine. She however tries her best to cheer for her brother in the autumn sports festival, and Wataru needs all the help he can get, being a nerd who is bad at sports. Wataru decides to enter the relay, but in the middle of the race he falls down and almost gives up, but Kaho's cheering encourages him to continue and everyone has fun even though they come in last.
17 It's Moxibustion...Blush
"Okyū Desu wa... Po" (おキューですわ......ポッ♥)
July 25, 2001 {{{FirstEngAirDate}}}
Haruka, being shy around her Beloved Brother Wataru, tries to ask him to take her out dancing at the ball, but Wataru sprains his ankle. Haruka decides to take care of him and Wataru's ankle quickly heals, and as a thank you, he takes her to the autumn festival.
18 ...Eternal...Vow...
"...Eikyō no...Chigiri wo..." (......永久の......契りを......)
August 1, 2001 {{{FirstEngAirDate}}}
Wataru is having a dream of Chikage, and when he wakes up, he sees his body still asleep on the bed. Freaking out, Wataru runs through walls trying to find someone who can see him, but no one can except for Chikage. Chikage says she can return him to normal if he first does a few things for her, and they proceed into another world where they have a trippy love scene, Chikage is kidnapped by the grim reaper, and they almost get married in a church. Wataru then returns to his body, and to the delight of all his sisters, wakes up.
19 Boxed Lunch of Love
"Ai no Obentō Desu no" (愛のお弁当ですのっ)
August 8, 2001 {{{FirstEngAirDate}}}
Shirayuki prepares bentos for everyone for their school lunches, and Yamada is jealous so he tells Shirayuki that Wataru isn't getting enough nutrition in the hope that she will make too much and he'll get the leftovers. Yamada's plan works too well and she starts making too much for every meal until Wataru tells her that they need smaller portions.
20 Christmas Love Destiny
"" ()
August 15, 2001 {{{FirstEngAirDate}}}
Wataru celebrates Christmas with his sisters. All 13 sisters prepare a christmas present for Wataru while he goes out shopping for one for them.
21 Me Two to Bro
"Aniki ni me two" (アニキにme two \(^o^)/〜♥)
August 22, 2001 {{{FirstEngAirDate}}}
Rin Rin introduces her latest invention to Bro Wataru—a robot version of herself. She based it on all the sisters so that it would cook and clean and be graceful and strong so it could help Wataru with whatever he needs. RinRin reveals that she wants to study robotics in America, and that when she leaves, she wants there to be someone who can help Wataru out.
22 Check it Out, Brother Dearest!
"Anichama, Chekkidesu" (兄チャマ, チェキデス♥)
August 29, 2001 {{{FirstEngAirDate}}}
Everyone notices that they each have an item missing, and Yotsuba decides that she will discover the culprit using her detective skills. While fixing dinner, Mami accidentally breaks a leg off of the music box, but hides the fact by making it look ok. Kaho comes by and bumps the music box, and when the leg falls off, she thinks she has broken it. Kaho tells Yotsuba and they take it to get fixed, but when they find out it will take a couple days, Yotsuba dresses up as the beautiful mysterious thief girl Clover and pretends to steal it to hide the fact that it's broken.
23 First Guest
"Hajimete no Okyakusama" (はじめてのお客様)
September 5, 2001 {{{FirstEngAirDate}}}
Wataru's friend Akio arrives at the island for a visit and all the sisters like him except for Mami, who hides and acts nervous. We find out that Akio is actually Mami's older brother, and that he is the one who has been e-mailing her orders, and that her orders are to force Wataru off the island using any means necessary. Mami refuses to do her brother's bidding any more, and Akio cold-heartedly tells her to just stay out of the way. When Wataru and Akio are about to go to sleep that night, Akio reveals to Wataru that he didn't just come to visit. Akio tells Wataru that his high school accepted him, and he wouldn't even have to start a year late. Akio came to take Wataru back to Tokyo.
24 Premonition of a Farewell
"Sayonara no Yokan" (さよならの予感)
September 12, 2001 {{{FirstEngAirDate}}}
Akio tells Wataru that he had actually passed the exams. Wataru is not sure how he feels about this, and though Akio is pushing him to return to Tokyo, Wataru wants to decide for himself. He spends the whole day debating, and Akio tries to manipulate Mami into swaying Wataru. Eventually Wataru decides to leave for Tokyo, but Mami decides to abandon her horrible blood brother and stay on the island. Chikage gives Wataru her pendant, her most precious possession, making the parting seem final.
25 I Want to See...Brother
"Aitai... Onii-chan" (あいたい...お兄ちゃん)
September 19, 2001 {{{FirstEngAirDate}}}
The sisters' house feels empty as they miss their brother and anticipate his return with all their hearts. Meanwhile, Wataru is back in Tokyo with Akio and is ready to forget his memories in Promised Island when Mami shows up, begging him to return. Even though Mami asks with all her heart, Wataru still refuses, though lost memories of a childhood promise Wataru made start to resurface.......
26 Promised Island
"Yakusoku no Shima" (約束の島)
September 26, 2001 {{{FirstEngAirDate}}}
Against Akio's expectations, Wataru returns to Promised Island for good. The sisters become so happy for his return that they cherish every moment with him. The only thing keeping it from being perfect is that Mami is still missing. A couple days later, when they start school, Mami returns as a new transfer student!!!! And to everyone's shock and surprise, Akio transfers to Promised Island as well in search of 'what is truly cool'.
There is also an episode 0 called Sister Princess Eve (シスター♥プリンセス 前夜祭) which was just a talk show/documentary which introduced the twelve sisters with their seiyus. It was aired a week before the first episode (March 28, 2001).

Sister Princess Repure (2nd season)

Except for the last episode, each episode is divided into two parts, labelled below as "A-side" and "B-side."

Episode No. Title
(English titles unofficial)
Original Air Date
1"Heart Days"
"Hāto Deizu" (ハートデイズ)
October 2, 2002
"Karen: The Secret Locket"
"Karen: Karen-chan to Roketto no Himitsu" (可憐 - 可憐ちゃんとロケットの秘密)
2"The Secret Garden"
"Himitsu no Hanazono... Nano!" (秘密の花園...なの!)
October 9, 2002
"Mamoru: When I Play Soccer..."
"Mamoru: Sakka wo Yaru Toki wa..." (衛 - サッカーをやる時は...)
3"The Temptation of Chestnuts"
"Maron no Yūwaku" (マロンの誘惑)
October 16, 2002
"Aria: The Day the Circus Came"
"Aria: Sākasu ga Kita Hi" (亞里亞 - サーカスが来た日)
4"It's Sleepover Day"
"Ehehe... Otomari no Hi Desu." (えへへ...お泊まりの日です.)
October 23, 2002
"Hinako: Piyo-chan and the Rainy Frog"
"Hinako: Piyo-chan to Amefuri Kaeru" (雛子 - ピヨちゃんと雨降りカエル)
5"An Endless Wish to the Shooting Stars"
"Nagareru Hoshi Nitsukime Negai wo" (流れる星につきぬ願いを)
October 30, 2002
"Kaho: The Shining Red Shoes"
"Kaho: Pikka-pikka no Akai Kutsu" (花穂 - ピッカピッカの赤いくつ)
6"A Mug of Big Bro and Me"
"Anii to Boku no Magukappu" (あにぃとボクのマグカップ)
November 6, 2002
"Rinrin: If the Spring Wind Blows"
"Rinrin: Nishikaze ga Fuitara" (鈴凛 - 西風が吹いたら)
7"The Magic Word"
"Mahō no Kotoba" (魔法の言葉)
November 13, 2002
"Chikage: A Golden Fruit"
"Chikage: Kin-iro no Kajitsu" (千影 - 金色の果実)
8"It's Visiting Day"
"Menkaibi Nano Desu!" (面会日なのです!)
November 20, 2002
"Yotsuba: Broken Unicorn"
"Yotsuba: Kowareta Yunikōn" (四葉 - 壊れたユニコーン)
9"Are You Close to Me... Bro?"
"Sobani Iruyo ne... Aniki" (そばにいるよね...アニキ)
November 27, 2002
"Haruka: My Swinging Heart to the Strip of Paper"
"Haruka: Yureru Omoi wo Tanjaku ni..." (春歌 - 揺れる想いを短冊に...)
10"The Red String of Fate"
"Unmei no Akai Ito" (運命の赤い糸)
December 4, 2002
"Marie: In the Sunny Day"
"Otenki no Ii Hi wa..." (鞠絵 - お天気のいい日は...)
11"The Box of Memories"
"Omoide no Takarabako" (思い出の宝箱)
December 11, 2002
"Shirayuki: Teaching of Madam"
"Shirayuki: Madamu no Oshie" (白雪 - マダムの訓え)
12"Dear Brother's Restaurant"
"Oni-sama no Resutoran" (お兄さまのレストラン)
December 18, 2002
"Sakuya: Holy Wedding"
"Sakuya: Hōrī Uedingu" (咲耶 - ホーリーウエディング)
13 Pure Christmas
"Pyua Kurisumasu" (ピュアクリスマス)
December 25, 2002 {{{FirstEngAirDate}}}
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