Battle Game in 5 Seconds

An anime television series adaptation by SynergySP and Vega Entertainment (with CG animation by Studio A-Cat) aired from July to September 2021.

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.

Akira Shiroyanagi (白柳 啓, Shiroyanagi Akira) Voiced by: Ayumu Murase (Japanese); Robbie Daymond (English) A 16-year-old sophomore who does excellent academically, but likes gaming instead because it is "unpredictable". His ability is called "Sophist", an ability that allows him to use any ability which the other person (opponent or partner) believes he has. He is somehow labeled as "My Prince" by Mion. Yūri Amagake (天翔 優利, Amagake Yūri) Voiced by: Aimi (Japanese); Laura Stahl (English) A 17-year-old high school girl who hates the word "coincidence" because she thinks that all the things that happen coincidentally lead to an unfortunate life. Her ability is called "Demon God" which allows her to multiply her physical ability by five times. She has feelings for Akira, though he does not reciprocate. Madoka Kirisaki (霧崎 円, Kirisaki Madoka) Voiced by: Kazuya Nakai (Japanese); Billy Kametz (English) A delinquent. His ability is to turn any stick into a sword that can cut through anything, including the effects of other abilities. Shin Kumagiri (熊切 真, Kumagiri Shin) Voiced by: Yūichi Nakamura (Japanese); Bill Butts (English) A wrestler. His ability is to become invincible for two seconds; this is shown visually as a suit of armour. Rin Kashii (香椎 鈴, Kashii Rin) Voiced by: Toa Yukinari (Japanese); Kennady Ray (English) A seductive and manipulative office lady who has the ability to create torture devices from body fluids such as blood, sweat, and saliva. Ringo Tatara (多々良 りんご, Tatara Ringo) Voiced by: Miyuri Shimabukuro (Japanese); Xanthe Huynh (English) A petite figured girl whose ability is "Plagiarist", which allows her to copy someone else's ability with about 1⁄10 of its real power.

Mion (魅音, Mion) Voiced by: Mayumi Shintani (Japanese); Lisa Ortiz (English) A catgirl who is a cruel sadist, she is interested in seeing people slaughtering each other for her own sake of fun. She is one of the Observers. Yang (ヤン, Yan) Voiced by: Akari Kitō (Japanese); Erica Schroeder (English) Mion's follower, dressed in Chinese style.

Created by Saizō Harawata, Battle Game in 5 Seconds was first launched as a webcomic, and a remake illustrated by Kashiwa Miyako began publishing on Shogakukan's MangaONE app and Ura Sunday website on August 11 and August 18, 2015, respectively. In October 2024, Miyako announced that the manga would enter on hiatus due to health and personal issues since the start of the year, stating as well that the series is approaching its end. The series resumed on January 9, 2025. Shogakukan has collected its chapters into individual tankōbon volumes. The first volume was released on February 26, 2016. As of July 10, 2026, 31 volumes have been released. Comikey is digitally publishing the manga in English since July 12, 2021.

In November 2020, it was announced that the manga would receive an anime television series adaptation. The series is animated by SynergySP and Vega Entertainment and directed by Nobuyoshi Arai with Meigo Naito serving as chief director, Touko Machida handling series composition, Studio A-Cat producing the CG animation, and Tomokatsu Nagasaku and Ikuo Yamamoto handling character designs. It aired from July 13 to September 28, 2021, on Tokyo MX and BS11. The opening theme song, "No Continue," is performed by Akari Kitō, while the ending theme song, "Makeibe Jikkyō Play" (負けイベ実況プレイ; lit. "Let's Stream a Playthrough of the Bad Ending"), is performed by 15-sai to Seiko Oomori. Crunchyroll streamed the series outside of Asia. Muse Communication licensed the series in South and Southeast Asia.