Izumi still love Arima, that already die.. then a senpai appeared and confess his love to izumi. But this guy's a yandere seme that always beat him.
It's a story about senpai and kouhai. Kouhai visits constantly the grave of one of his friends (Arima's) and always rejects senpai invitations to hang out, this senpai attracted to him, and confess.
Mitto mo Nai Koi