Funeral Procession of K

Funeral Procession of K (Kの葬列) is a manga from Maki Kusumoto, author and illustrator of Die Todliche Dolis and Hikarabita Taiji.

Summary
Mikaya, moving into an apartment investigates into the mysterious death of a man named "K" who used to live in the same room as the one he's moving into. The day he moves in, all the residents were doing a funeral procession in honor of K, but there was no body in the casket. Despite not having a corpse, everyone of the apartment are absolutely certain that K is dead. As the story unfolds, Mikaya dwells deeper into the mystery, and finds himself plagued by disturbing dreams of K. Mikaya's eerie journey continues in the manga's second volume, revealing his true connection with K and K's story.