Sahoko Quest: Inkya Joshi, Shinshi Muke Doujin RPG Sekai de Yuusha ni Naru

Due to overwhelming popularity, it's now a full serialization! A shy, self-doubting girl is transported to a world that looks strangely familiar... and way too erotic!? In a world ruled by sex battles, her goal is to clear it while staying a virgin! From Toshinori Takayama, the creator of i・Shoujo, comes a new isekai pleasure fantasy!

This manga follows an omnibus format, in that the characters the story focuses on changes every so often. The first characters, Tetta and Ginko's story ends at chapter 3, but all the characters are recurring, and sometimes, show up again in the future chapters. --- There is a magic love app that supposedly helps people's dreams of love come true. The first story of this love app follows Tetta and Ginko, friends who have bickered since grade school. Tetta looks up the magic app on a whim, and ends up with an application that is connected to Ginko. When he manipulates the "Ginko" on the app, it affects the real girl. He's embarrassed to have it in the first place, but he can't uninstall it without inputting Ginko's measurements. Whether he actually likes Ginko romantically or not, it seems that this app could only make the situation worse!