The Sea of Afumi: When the Waters Shook
ダンジョンで成り上がれ! : 幼馴染からも嫌われてゴブリンにさえ勝てなかった俺が、ダンジョンルーラーの指導を受けたら強くなれたので妹と無双します · だんじょん で なりあがれ! : おさななじみ からも きらわれて ごぶりん に さえ かてなかった おれ が 、 だんじょん るーらー の しどう お うけたら つよく なれたので いもうと と むそうします
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
It's been 30 years since dungeons appeared in Japan. Kyoichi passed the entrance exam to the same extremely competitive high school as his childhood fiancée, Tsubaki, but rumors of him kneeling before a goblin made him the target of teasing in class. He explores the dungeon in an attempt to turn the situation around, but is defeated by a group of goblins. Thinking of his younger sister, Koyoi, he prepares himself for death... when he is saved by the Dungeon Ruler, Kyoji. This encounter marks a turning point in Kyoichi's fate. Get stronger with every battle! The story of conquering unrivaled dungeons with your sister begins! (Source: Takeshobo, translated)
Source: AniList
External databases: AniList
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