Clara is now a teacher at Toshi's high school. Because of their circumstances they pretend to not know one another yet Clara is so clingy to Toshi that she's even ruining his chances with girls his age. Of course, all of his male classmates want to fuck Clara.

When Toshi notices that Clara has a vibrator inside of her during school he confronts her about it. One thing leads to another and she forces him to get the toy out of her himself. 

Her loud moans and fingering from Toshi caused another teacher to find them (He looks like an early version of Gonda who appears much later) but Clara's toy somehow shoots out of her and knocks him out. 

From this point, Toshi's boner causes him to succumb to her seduction and Toshi continues to be trapped by her escapades .