Battle in 5 Seconds After Meeting

It was just a usual morning.

Akira Shiroyanagi, a high schooler who loves games and Konpeito (Japanese sweets), is suddenly dragged into a battlefield by a mysterious girl who calls herself Mion. The participants are told that they are "erased from the family register, involved in an experiment, and have gained certain powers." Akira is determined to win the game with his newfound powers and destroy the organization.