Seiho Boys' High School!(2006)

Men's Kou

When a pretty girl shows up on campus, the whole school is sent into a frenzy. It's not often these sheltered youths get a real living and breathing female within their midst. The boys want to help her out but are they in way over their heads?

(Source: VIZ Media)

Note: Includes the one-shot "Gyakuten Guilty (Guilt Reversal)".