Kono Minikuku mo Utsukushii Sekai

A high school student named Takeru Takemoto works as a part-time bike courier. While making a delivery, he notices a strange light and falls into a forest, where he encounters a girl named Hikari emerging from a glowing cocoon. Hikari is naked, which embarrasses Takeru, but they are soon attacked by a monster. In the confrontation, both Takeru and Hikari reveal abilities tied to their alternate selves, though Takeru has no understanding of what is happening.