After losing a fighting game match to his club-president senpai Kisara — who was ranked near the top and beat him without difficulty — Yoshito is required to join her cyber-research club. It gradually gains members: his childhood friend Kuon, who is also the student council vice president; his dependable younger sister Rin; and his classmate Kotone. At the start of summer vacation, the club's faculty adviser Kanae asks them to test a love simulation game she is developing. All of the female character avatars are being played by the girls in the club. Yoshito's avatar, it turns out, has an AI modeled on his own personality. Interacting with him inside the game, the girls say things they would never say in real life.