Karigal

Mozuno Futoshi is a small, weak-willed boy who has the unfortunate "prey nature" of being harassed by delinquents and falling into open manholes in his daily life. But then, a dark-skinned gal named Cacao appears before him, clearly a bubbly girl who is the polar opposite of him. With her uniform loosened, her breasts overflowing, and for some reason, her abs, she catches Mozuno's eye and calls him "Prey" and makes him the target of her "hunt"...!?

(Source: Champion Cross, translated)