Ace and the gang goes to the Light City and hears about the almighty Dragon Caller, Sturgeon. Hoping they can get some training from him, they set off to find him with a boy named "Astell." However, they soon find out who the boy really is...

The mansion houses countless contraptions and numerous deathtraps. Regardless, Takurou never hesitates to hit a button or push a level. “If you don’t move forward at all times, nothing will change.” Even when things suddenly get, really, really bad...