Erect!

In Mitsuoka-chou, Lilythtia International School draws students from overseas. Kento, a local who helps at his father's flower shop, Florist Ogiwara, dreams of taking over the family business. One day, he's attacked by a beautiful girl from the school, waking in a hospital to learn she's Runastia, a frail succubus princess. Her servant Riel explains that Kento's unique life force might cure Runa. After consideration, he transfers to Lilythtia, which is secretly a school for succubi. Surrounded by erotic classmates, can he survive without being drained? From Hau~Omochikaeri!