The childhood friend who suddenly disappeared when we were young came back ten years later. From another world.

When I was in elementary school, my best friend Chitose went missing. Despite searches by my parents and the police, we couldn't find a single clue. Ten years have passed since then―― I, Kanzaki Mahiro (22), had become a hopeless, drifting freeloader living as a part-timer. My only source of meaning in life now is watching girls' anime. And then, Chitose suddenly appeared before me, looking exactly as she did ten years ago. What?! It's true that you went to another world?!