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。

[DeepL Translation - needs review] My sister is enrolled in a knight training academy for girls only. Even at the kingdom's most prestigious academy, the younger sister, who is an excellent student, is active in all aspects of her life... I told her that you are much stronger than I am! 　No, I'm just a commoner. ......? (*That's a lie. (*That's a lie. He's just unaware of it.) 　(*The strongest female knight in the school made me realize the difference in strength in an instant.) 　(*My brothe...