**Length**: Very short (< 2 hours)
**Year**: Japan 2013-05-25, English Version 2020-02-20
Reclusive virgin nerd Youta’s childhood friend and long-time crush Rio visits him one day with shocking news and an equally shocking proposal: she has a collection of sex friends, and he’s invited to become one of them! Can he get over his initial reaction of disgust and jealousy at seeing this side of Rio and build a whole new kind of relationship with her?
Source: [JAST USA](https://jastusa.com/games/sekai)
1. No need to install.
**!!!** Thanks to Crozisvas!