転生魔王の大誤算 (Series) favorite_border

[DeepL Translation - needs review] Volume 1: Introduction:. Winning all the time even though you don't want to win!　The talented Demon King's army is making rapid progress, winning battle after battle! Even the most powerful demon king of all time, Kengo, has a secret he cannot divulge. The situation is worse than it was before his reincarnation! In his previous life, he was Inui Kengo, a herbivorous high school student who was mistaken for his brother, a legendary delinquent and respected b...