Sadayo Kawakami

Sadayo Kawakami is a second year homeroom teacher at Shujin Academy. While initially somewhat strict towards Joker, things change once he discovers her part-time job at a sketchy maid service. Fearing what would happen if her co-workers found out, she strikes a deal with him, allowing him to slack off in class in exchange for his silence.

At the former school that Sadayo used to teach at, she ended up tutoring one of her students who was struggling to stay caught up in class. The student was struggling because he also had a part-time job to support the debts his guardians were creating. The student ended up dying in a car accident and the guardians decided to push the blame onto Sadayo for "overworking" him, and have been exploiting her for money ever since.

That said, despite the stress she has had from working two jobs, and how unmotivated she seems at times, she remains diligent and dutiful enough to carry on, and to make sure that she can to do the best for Joker and her other students. However, such diligence will be put at test today, as one way or another, she will be left bare nude for everyone to see, whether she likes it or not.

What could possibly happen to such a busy and overworked lady that would leave her exposed ?. Did one of her students played a cruel prank on her ?, did she got into an accident while teaching class ?, or did one of her maid jobs required for her to go nude ?