Metamorphosis Den(1976)

Metamorphosis Den

A mysterious boy transfers to a high school famous for its college-admissions rate! He agitates for reform against his classmates, who are all about studying! A school super-romance.

(Source: Akita Shoten, translated)

Note: Volume 2 includes the one-shot "Syrinx Pan" (シュリンクス・パーン).