Following the passing of his parents two years prior, Naoto Watari took on the role of sole guardian for his younger sister, Suzushiro "Suzu" Watari. In order to ensure Suzu's safety and happiness, Naoto moved in with their aunt and dedicated himself to Suzu's wellbeing. This commitment to his sister has prevented Naoto from joining any clubs or socializing with peers, leading to him being mocked and referred to as a "siscon" at his school. However, more challenges lie ahead for Naoto than just the taunts of his classmates. The arrival of a new transfer student, Satsuki Tachibana, awakens traumatic memories from Naoto's past that he had believed to be long forgotten. To make matters worse, Satsuki is hiding secrets that jeopardize the stability of Naoto's already fragile existence.
