The Irregular Of The Royal Academy Of Magic ~The Strongest Sorcerer From The Slums Is Unrivaled In The School Of Royals ~

O Irregular da Academia Real de Magia, Oritsu Maho Gakuen no Saika-sei~ Hinkon-gai (Suramu) Agari no Saikyo Maho-Shi, Kizoku-darake no Gakuen de Muso Suru~, 王立魔法学園の最下生 ～ 貧困街上がりの最強魔法師、貴族だらけの学園で無双する ～, Ouritsu Mahou Gakuen no Saikasei: Slum Agari no Saikyou Mahoushi, Kizoku darake no Gakuen de Musou suru, 王立魔法学園の最下生～貧困街〈スラム〉上がりの最強魔法師、貴族だらけの学園で無双する～

The Person I Met In-Game Was Actually My Big Sister.