Originally straight

Yusei was confessed to by a guy when he was in high school. He rejected Otsuki since he is straight and refuses to date a man. Years later he meets him again when he was told that Otsuki is dating his superior. However, Otsuki keeps on seducing him and his will is starting to slip.

On his way back from work on Christmas night, Yamada discover a drunk and crying high school boy and takes him home. That boy was mulling over being in love with someone of the same sex. A straight adult and a gay high-schooler.
It is a piece that sets gender aside as their hearts grow ever closer.

Two friends who look at each other differently, a straight one and a gay one, they?re still together since Highschool! is there more to their feelings?