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After My Sister Enrolling in Girl Knights' School, I Become a HERO.

妹が女騎士学園に入学したらなぜか救国の英雄になりました。ぼくが。

My little sister enrolls in an all-girls knight academy, the most prestigious in the kingdom, where she quickly excels in every subject. But she insists that her older brother, a self-proclaimed ordinary commoner, is far stronger than she is. He doesn't believe it, though everyone around him can see the truth: he is insanely powerful without realizing it.

Because of his sister's boast, a female knight from the academy challenges him to a mock battle. After winning effortlessly, he gives her a post-battle massage, which she enjoys so much that it becomes popular among the nobles. Just by acting normally, he catches the attention of the princess, and soon he finds himself surrounded by a harem of lady knights. All he wants is a quiet life, but his hidden strength keeps drawing him into increasingly extraordinary situations.

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