聖騎士の俺が好きになったヒロインが続々とアイツのハーレムメンバーになってしまうんだけど俺の何がいけないのか誰か教えてくれ！！【本編完結・コミカライズ決定】 (Associated Names)

Yamada Ichiro, who was summoned to another world, and the black-hearted handsome Ryuguin. The appraisal results show that Ryuguin is the hero and I am the Holy Knight. While the hero Ryuguin is playing around without making any effort, I’m always full of scars and tattered because I went out to clear the labyrinth countless…