Ano Hito to Nitenai Kuchibiru

Synopsis

Collection of short stories:1. Anohito to Nitenai Kuchibiru Kaji was in love with his sempai for years but his sempai got married and had a child. Kaji takes care of the kid and watches him growing up...2. Kuchibiru kara Biyaku sequel to the above3. Blood 4. Kagari Oni 5. Datenshitachi no Yoru6. Double Snake A former gangster has turned into a regular office worker, but he still sleeps with his gangster lover. But one of the newbies doesn't like the fact that his favorite 'boss' is having a relationship with an office worker. (Source: MangaUpdates)