Ohayou toka Oyasumi toka

Wahei is just an ordinary guy, who has nothing against his family, but thinks dealing with them is a bother. He just wants to live alone in comfort, but one day, he receives a letter from his father, along with a visit from 3 half-sisters. The letter says that the sisters have no other relatives, so they should stay with Wahei. Wahei accepts reluctantly at first, but through his interactions with the sisters, he begins to remember the importance of family...

(Source: Silent Manga Audition)