IPZZ-697 A cheeky schoolgirl, Yume Nishimiya, who was repeatedly teased and trained by a middle-aged teacher she despised, ends up discovering intense nipple sensitivity to the point of losing control.

Yume is called in by her homeroom teacher, Saito, who is known for being overly attached to his mother. He tells her that, because of her attendance and grades, she may not be able to graduate if things continue as they are. Confused, Yume is then told that she will need intensive make-up classes during summer vacation.

Threatened by an unpleasant middle-aged teacher, she is forced into a miserable summer remedial program and made to attend school without a bra, which is deeply humiliating. Over time, her sensitive body becomes more reactive to even the slightest stimulation, and she is repeatedly teased and tormented in a relentless, persistent way. The experience becomes an unbearable ordeal of shame and discomfort.