元・世界1位のサブキャラ育成日記 ~廃プレイヤー、異世界を攻略中!~ 1

[DeepL Translation - needs review] Volume 1 Introduction: Sato bets his life on a game of netoge and reigns as the world's No. 1 ranked player. However, one day, he is reborn in a world that resembles a game! Using his knowledge of the game to the fullest, he and his fun-loving friends start from zero and aim to become "World No. 1" once again!

(Translator: DeepL)