When people around town start getting transported to a mysterious space, Yatsuha must embrace her family's power, and protect the inhabitants of the city.

Invasion from within! The city of Mangetsu is under attack, besieged by nightmares, creatures slithering out from Dream Worlds parallel to our own! It's up to Yatsuha and her new allies at Yamanashi Energy Labs to drive back the intruders, seal the Dream Worlds, and preserve the city's peace!