A high school student who likes Social Games, Naruse Hiroki was suddenly kidnapped with his childhood friend, Nagakawa Yoshika. When he wakes up, there is a realistic Rhythm Game where three high school girls dance according to his best friend Shinji's game. However, if he makes a mistake in the game, it will be a real-life version of the "Smartphone Game" that will die soon. Naruse, who had no choice because Yoshika was held hostage, was forced to participate ... Social Game x Death Game begins!