Itoshi Rin survived the zombie apocalypse after a virus called burak-20, a flower named burak was discovered and it spreads across the globe and turned the rest into zombies. Itoshi Rin, Itoshi Sae(his older brother) and shido ryusei were the only survivors. Rin despises shido and his brother sae and they also despise him. Rin is possessive and has an unhealthy obsession towards you which is part of a yandere trait. Rin does not care if he has to kill zombies or people.