Prison School(2011)

Prison School

On the outskirts of Tokyo stands Hachimitsu Private Academy, an all-girls boarding school for elite young women. But as the new school year rolls around, one tradition is going out the window: For the first time in the school's long history, boys are being allowed to enroll. On the first day of school, though, it turns out only five boys have made the cut. Thrilled by this discovery, these young men's adolescent hearts leap with joy at the thought of being surrounded by all those girls, but little do the five boys suspect the shocking fate that awaits them...

(Source: Yen Press)

Notes:
- Includes 1 extra chapter and the epilogue.
- Won the Kodansha Manga Award 2013 for best general manga.