Furimukeba kimi ga ite (2000)

Naoya, Kazuhiko, and Shinpei, were raised by their grandparents without the love of their parents. One day, Naoya's heart is shaken when Kazuhiko comes out of the closet. As a matter of fact, Naoya is also gay, but has been hiding and using his girlfriend Akira as a cover. One day, Jinko, who calls himself the half-sister of the three brothers, comes for a visit, and the strange lives of the quator will continue.