Hanken: Kasshoku Gal wa Boku wo Kurau

A college student named Kaito finds himself drawn to a mysterious research facility known as Hanken. There, he encounters a tanned gal named Rika, who seems to have a peculiar interest in him. As he gets closer to her, he discovers that the facility conducts secret experiments involving human subjects.

Rika's true nature is far from ordinary, and she begins to consume Kaito's energy in a literal sense. As their interactions grow more intense, Kaito must navigate the dangerous dynamics of the facility and Rika's insatiable appetite. The line between pleasure and peril blurs as he becomes entangled in a web of desire and survival.