まにょっこ☆みのりん～僕（♂）が魔法少女!?～

Minori is walking home one day when he's assaulted by a strange man.

Suddenly a magical talking frog appears and gives Minori the power to fight him!

Turns out the man is actually a Geist, a soul escaped from heaven who seeks energy through sex.

And so Minori makes a contract to become a magical girl and fight these spirits...