How to Develop a Girlfriend Who Is a Middle-Aged Girl

About the girlfriend being a chuunibyou. (Fog w) Introduction to the official version: He was reborn in a parallel world and became a vampire. At the beginning, he had a chuunibyou girlfriend from the sky. The aura gradually recovers, strange things emerge one after another, and the originally peaceful high school life is broken. Monsters, humans, disasters, weirdness, order is collapsing. . .