Yamashiro Yuuichi♂

A teenager that lives with his twin older sisters, Mikoto and Haruna. The three have done their best to cope with life after the death of their parents in a train accident two years before the story begins. Yuuichi is haunted by a subconscious attraction to his older sisters as well as a general feeling of indecisiveness when it comes to the women in his life.

[From Moroboshi Yuumei's review]