Aoharu X Machinegun

Hotaru Tachibana has a strong sense of justice, a tendency to take matters personally, and a snappy masculine sense of style that makes many mistake her for a boy. So, when Hotaru believes that her new neighbor has taken advantage of a classmate and barges into his club, the inevitable gender confusion finds her being challenged to an air pellet gun duel... that an overconfident Hotaru soundly loses! However, unaware that "he" is, in fact, she, owner Masamune uses a hefty bill for damages to coerce the naturally talented Hotaru into joining his incomplete airsoft team. But the catch is - the team rules don't allow girls, forcing Hotaru to pretend to be one of the guys around Masamune and the other team member, erotic comic artist Toru, while she plays off her debt in AOHARU X MACHINEGUN!!