Hana is a third-year student at a women's university. Hana knew from the internet and magazines that there were quite a lot of women who were enjoying various types of play. Hana is Kokoro and has always wanted to try different things herself. However, contrary to her wishes, she had a hard time finding a good sex partner, so she started looking for a suitable person on a popular SNS site. Then, one day, she met an older man who seemed to be doing interesting things in groups. She accepted the invitation, saying, "You can have an experience you've never had before," and finally the day of the meeting arrived...