A female amateur who went to a love hotel with an older man after returning home from club activities. (Separately, the text mentions "Sayama Yumi" and "HEYZO-3071".)

Yumi-chan, back from club activities, did some things she shouldn't have done—today she even came to the hotel with an older man while wearing a tracksuit! Yumi-chan, who has no boyfriend and only four partners in her life. Oh dear, how can there possibly be only four people at this rate! A girl who lies must be taught a lesson! Therefore, I'll torture her with toys to make her reflect on her actions. Hmm? You even brought your school uniform? Great, change into it! Oh dear, the school uniform is so wonderful! Thanks to it, my little brother is energized again! Let's continue, Yumi-chan!!