Shota's grades aren't improving because he's always playing pranks. Mio, a busty cram school teacher, can't stand to see this and suggests private lessons. However, private lessons with Mio only lead to Shota's pranks escalating! Shota plays with Mio's nipples, begs her for a blowjob, and even sleeps with her at night! Mio, who has been tormented by his dick, eventually falls into the role of a female.