1: crowded train, guy sees gay manga on another kids phone and they meet up at school again become friends and read gay manga together then fall in love. 2: infirmary teacher likes pain and confuses himself as a sadist but soccer star student shows him he's an M instead. 3: beautiful student and main meet in chemistry prep room were beauty is sleeping and main is allows to touch and bj beauty. 4: friends for 3 years saying goodbye because one can't date the other.
Mousouka, Koi o Suru.