Bra Kon No Ane Ni Jitsuha Saikyo Maho Shida to Bareta. Mo Gakuen De Jitsuryoku Wo Kakusenai (Fujimi Fantasia Bunko) [Light Novel]

[Machine Translation] He is one of the most powerful, but he wants to live comfortably. Alvin has been pretending to be incompetent with this intention. However, his sister, who loves him so much that she even asks him to marry her, sees his power inadvertently! I believed in you, sis! I have to go brag about it to everyone right now! Then the rumors spread instantly and her treatment at the school changes 180 degrees! She instantly kills students who don't believe the rumors and challenge her, is treated as the strongest mage by the princess who is also the leader of the knighthood, somehow becomes a great knight, and has more girls around her - where is the peace and quiet she was aiming for? Where is the peace I was aiming for? I'm going to fall in love with you even more, Sis! I'm going to fall in love with you even more, sister! My sister is hugging me so much that I don't care about such problems.

最強クラスの実力を持つが、あくまで楽に生きたい。そんな思惑で無能のフリをしてきたアルヴィン。しかし自分のことを溺愛する姉(結婚を申し込むほど)にうっかり力を見られ!?「お姉ちゃん信じてたよ!今すぐ皆に自慢してこなきゃ!」すると噂は一瞬で広まり、学園での扱いも180度激変!噂を信じず挑んできた生徒を瞬殺し、騎士団長でもある王女様にも最強魔法士として扱われ、なぜか騎士団でも偉くなり、なんか周りに女の子も増えて―目指していた平穏はどこに!?「かっこいいー!お姉ちゃん、更に惚れそうだよぉー!」...そんな悩みを余所に姉がめちゃくちゃ抱きしめてきます。