Kemba Gakuen is a school where Asagiri Chihaya attends. In the past, he was involved in an accident where he lost some important memories. His beautiful childhood friend named Miyamato Satsuki calmly advised him to try and remember. As life goes on, Chihaya heard rumors in social media about the existence of an app called "Alive". It is a legendary gaming app but shrouded in mystery. Still, Chihaya continues life as a regular student. But one day, an application has been installed on his smartphone and Chihaya realizes the name of the app: “Alive” The app itself can change the fate of the people around it where Chihaya himself does not realize it.