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Official Site: Ryo Shirakome

is a Japanese light novel series written by Ryo Shirakome and illustrated by Takayaki. Originally a web novel, the series has been published in print since 2015. The series follows Hajime Nagumo, who is transported to another world with the rest of his class to fight in a war against the demon race. After he is betrayed and left to die by one of his classmates, Hajime begins a journey to improve himself and find a way to return home. The novels are licensed in English by J-Novel Club, with Seven Seas Entertainment publishing them in print. The English translation of the light novel was done by Murtaza Burhan. A prequel light novel was published in 2017.

The series has received a manga adaptation, serialized on Ovelap's Comic Gardo website since 2016, as well as a yonkoma comedy spinoff and a manga adaptation of the prequel novel, all three licensed by Seven Seas. An anime television series adaptation by White Fox and Asread aired from July to October 2019. A second season by Asread and Studio Mother aired from January to March 2022.

High-schooler Hajime Nagumo is bullied by his classmate for his relationship with the class idol, Kaori. When he and the rest of his class are transported to a fantasy world, all of his classmates get powerful magical abilities, while Hajime only gains the basic alchemical magic to transmute solid materials, a common ability usually found in craftsmen and smiths. During a dungeon raid, he is betrayed by one of his classmates and dropped to the bottom of the dungeon. He survives the fall and creates weapons to escape the dungeon and become stronger. On his journey, he meets with the imprisoned vampire Yue, and later is joined by the bunny-eared Shea, the perverted dragon Tio, and others.

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Hajime Nagumo has not been a contender in any CBUB matches.