"Recollection of sex with a tutor in school days, Yumi's case" Yumi walking along the river. I suddenly stop and look at the surface of the river and remember the old days. It was about 15 years ago on the way home from school... As I was looking at the flow of the river while remembering such things, I happened to be called out to my tutor at that time. I will invite you to my home for tea after a long absence. And Yumi, who was asked by her teacher to show her the uniform she wore 15 years ago...