Isekaigaeri no Yuusha wa, Dungeon ga Shutsugen shita Genjitsu Sekai de, Influencer ni Natte Kane wo Kasegimasu!

An ordinary high school student finds himself mysteriously transported to a fantastical realm where he discovers he has the potential to grow stronger through unique abilities. After spending time developing his powers in this new world, he eventually finds a way to return home. However, upon coming back to his original world, he discovers that it has changed in unexpected ways - strange new phenomena have begun appearing in modern society. Now, he must adapt to using his extraordinary experiences to navigate this transformed reality where fantasy elements have started merging with everyday life. A modern dungeon fantasy that explores what happens when someone returns from another world only to find their home has become something entirely different. (Source: Kadokawa, translated)