Battle Game in 5 Seconds (出会って5秒でバトル), also known as Battle in 5 Seconds After Meeting, is a Japanese manga series written by Saizō Harawata and illustrated by Kashiwa Miyako. It has been serialized in Shogakukan's MangaONE app and Ura Sunday website since August 2015. It is a remake of Harawata's webcomic by the same name. An anime television series adaptation by SynergySP and Vega Entertainment (with CG animation by Studio A-Cat) aired from July to September 2021.
Plot
Akira Shiroyanagi, a 16-year-old high school student with excellent grades and a hobby of playing games, is bored with his normal daily life. He was attacked by a mysterious bandage man who suddenly appeared there, and succeeded in repelling it like a game, but was killed by a magician-like woman who appeared afterwards. Kei wakes up in a mysterious hospital-like facility, and the magician-like woman, Metsune, appears in a venue where only people in similar circumstances are gathered. It is explained that each of them fights using the "ability" given to them. After the 1st program of one-on-one battles, the 2nd program of 1-on-1 battles in groups of 5, and the 3rd program of team battles, the stage shifts to the 4th program, in which 6 groups of 12 people, including one observer, compete.