What would you do if I told you you could go back to the world you came from?

Hiro decides to help Hibiki develop the "Otherworld Connecting Machine" that he was taught by a certain alchemist.

As they share the same time together, they begin to understand a new side of Hibiki. Then one night, ...... Hibiki casually cut in with this.

Hey, do you want to hang out with us?

Her relationship with Hibiki began in an unconscious way. But then someone from "Hozuki", Hibiki's hometown, comes to visit.......