Kenka Banchou Otome 2nd Rumble!!

Hinako spent a year disguised as a boy at Shishiku Academy to help her twin brother Hikaru. It worked. She survived the battles, made real friends, and came to feel like she belongs there. Now she is a second-year student, the reigning top dog, getting chased around by freshmen — and fielding rumors that the school might be shutting down.