Hitohira no Koi ga Furu

Hitohira no Koi ga Furu (ひとひらの恋が降る) is a shōjo manga series written and illustrated by Yuu Yabuuchi. This story is about a young girl who is dealing with the start of her "love life" with her boyfriend while she is growing up and discovering the hardships of a relationship.

Story
Haruru is normal girl starting middle school. Her life is pretty normal except for the fact that she usually has any contact with her boyfriend, Nagi, who goes to a famous middle school and needs to study all the time. And that puts her uneasy, not knowing how to talk to him. Her life start to be more difficult when she is asked to be the manager of athletic club by Sou, an old friend of her best friend Chika.

Meeting new people and getting to know the better she learns more about herself, love and her friends... But not everything goes as smoothly as we want to, because there's a jinx at Haruru's school - if a couple sees the blue train at 6 am together, they'll be together forever! But if a couple sees the blue train at 10 pm together, they'll break up!

So... what will happen after Haruru sees the blue train at 6 am with Sou?