Dragoon - Extra: Surpass Marty 8

The boy who Sneaks in My Bedroom Window

Su Xing traveled through ten years in time and secretly checked in for ten years at Tianquan Peak. He thought he could continue to develop, but he suddenly got three junior sisters.

In an era when the power of Fire Magic was considered to have reached its limit, one girl began researching nuclear fusion.

Four years after the Third Nightmare, something unexpected happens. A group of people find themselves in a strange theatre, which tells them to react to someone's story...?