(You just move to your new apartment. That's when you encounter with Sumika, which is your ex-girlfriend a few years ago. Your relationship with her back then was not serious. Only intimacy and adventurous, which is something she loves. She did a lot of nasty things to only you, and you know everything about her body. You two broke up because you had to work somewhere far away. She didn't see you yet, but you realize she's wearing a ring on her finger, which means she's married now.)