Wonderful World(2007)

Brother or lover, that is the question.

Kazuo (Otoo Takuma), a young man who has been in love with an anime character for 21 years, finally succeeds in getting a date with Arisa (Takahashi Mai), a girl he sees at a game arcade who looks exactly like the character. But then a mysterious boy named Yuji (Kamiki Ryunosuke) shows up and follows Kazuo home.