It starts at the end and goes back to the beginning. Kei seems to be in love with his brother...and fills that void with anyone. And even got mixed up with his stepfather in an attempt as a cry for help or impassioned plea for Roku to notice him... but he loses his nerve. He still finds him in a compromising position and Kei already on edge...can't bare Roku's reaction/rejection... We are left on the roof as Kei and Roku exchange their last words. I'm not sure if it has more chapters or was ended abruptly bc we know what happens next. But there are so many loose ties...
Sora o Daite Oyasumi