I Got a Cheat Skill in Another World and Became Unrivaled in the Real World, Too, Vol. 6 (light novel) — Miku

Everyone Needs a HeroDemons and corrupt fallen deities have been causing trouble in the other world, so Yuuya could use a break. Thankfully, now that exams are finally over, he can enjoy summer vacation. And nothing says summer like a day at the beach and goofing off with friends! All Yuuya has to think about is how to react to cute girls in swimsuits and a sudden job at a beachside café. That is, until the group goes to a spooky shrine for a test of courage, and they come face-to-face with a very REAL evil that looks just like a Demon...The appearance of an unexpected hero will shake things up in both worlds!