A box that grants three wishes is a dream come true. At least that’s what Keita thinks, until he opens the box and finds a girl inside. But this girl is no genie—Maki’s a devil princess and she’s come to take Keita’s soul! But she can only take his soul after he makes his third and final wish.

As a sheltered demon with little knowledge of how to be evil, Maki must rely on her trusty guidebook to learn the nefarious arts and trick Keita into using up his wishes. Until then, Maki’s going to live with Keita until he can’t stand living anymore!