女騎士塾に入学したら、弟スキルで無限甘やかされ!?

Otul, a younger brother who looks just like his genius older sister, ends up enrolling in the Mii-fe School for Female Knights in her place after she suddenly disappears. He cross-dresses to keep from being found out as a boy, but he immediately gets caught up in trouble—— "If only I had power like my sister... Help me, sister!" The power Otul awakens to after shouting that is the "Absolute Younger Brother Ability"!? A dream-like isekai fantasy where he gets doted on by the older sisters of the academy, begins now!