Naruse Hiroki, a high school student who is addicted to Gacha games, decided to confess to his childhood friend Nagakawa Yoshika. However, after school, the two were suddenly abducted and imprisoned. When he woke up, there was a strange stage where three high school girls were dancing while his friend, Hatanaka Shinji, was playing a rhythm game.

What was taking place here was a real-life "smartphone game"! If you make a mistake, you will die immediately. Naruse, who "pulled" Nagakawa, decides to devote himself to this unreasonable event! Social Game x Death game commences!