Fukutsu no Zono

Deto and delinquent Zono are merely opponents. But then Deto discovered Zono's weakness. If his neck is touched, Zono will let out erotic sounds. Hearing Zono's erotic moans, Deto's lower-body reacted and left him confused. One day, Deto ran into Zono, who was beaten into a pulp by his father, despite being very strong in fighting. Deto rushed in to rescue Zono. And why was Zono wearing fancy, cute-looking clothes?

(Source: Kadokawa, translated)