I Got Caught Up in a Hero Summons, but the Other World Was at Peace! v01 (2021)

English translation of the Japanese manga Yuusha Shoukan ni Makikomareta kedo, Isekai wa Heiwa deshita (勇者召喚に巻き込まれたけど、異世界は平和でした).
An isekai fantasy that's more about making friends than making war!
Miyama Kaito is no hero. He's just a normal university student who gets caught up in a hero summons with an actual Hero. But even "Hero" is just a ceremonial role these days, ever since the Demon Lord was killed centuries ago. In a world where demons are chill, nobles are no longer corrupt, wars are a distant memory and there are no more epic quests to complete, what's a regular guy to do? Why, build a harem, of course!