In The Heavenly Prison Devil Enchants Me Gn Vol 01 (Mr) (C:

Kaoru Shabana’s been coddled his whole life and yearns to remake himself into a splendid grown-up-a true man among men. Seeking to get a fresh start at achieving independence, he enrolls in a prestigious academy on a remote island. There he meets Kanra, a tantalizingly tall young woman, who reveals that the school of his dreams is actually a nest of succubi! Reduced to little more than a devil’s plaything, can Kaoru escape from this heavenly prison before he’s sucked dry?!