Erotic x Anabolic

Kyousuke Ageki, a fat guy with a big appetite, has always been interested in Itsuha Mitsukura, a girl who doesn't stand out in his class. He comes across her alone on the rooftop after school, exposing her erotic body in an extreme swimsuit! Kyousuke finds out Itsuha's unexpected secret...!
(Source: Akita Shoten, translated)