Otome to Chigiri

Otome to Chigiri (乙女とちぎり, lit. "Maiden and Promise") is a manga series by Kenetsu Satou. It was serialized in Champion RED.

Plot
In the story, protagonist Futaba Chikiri attends a school where, by the rules, the loser of a duel must obey the winner. Aiming to be the strongest, Futaba challenges the school leader Kaguya Otomezawa.