Seiichi and Saria train under Artoria to become adventurers. During their training the three of them are teleported into a dungeon by a demon’s trap. The dungeon they find themselves in the stronghold of the Black Dragon God, the strongest member of the Demon Lord’s Army. Artoria gets separated from Seiichi and Saria in the dungeon and the giant Black Dragon God appears before her. Then that overwhelming threat attacks! Can Seiichi and Saria save her in time?!
High school student Hiiragi Seiichi is bullied by his classmates for being a "loser." One day, his entire school is suddenly transported to a video game-like world of swords and sorcery. When he accidentally eats "the Fruit of Evolution," his life as a successful "winner" begins.
