In the windy city of Fuuto, private detective Shotaro Hidari works with his friends to protect the citizens... in more ways than one. But a chance encounter with a bewitching femme fatale might spell a whole new kind of trouble for him, and his city.

When a popular video game company's idol-spokeswoman/head developer starts receiving death threats, the Narumi Detective Agency is brought in to protect her.

The final confrontation with the Meganeura Dopant is at hand, and just as Tokime starts to settle in at the Narumi Detective Agency, a threatening force in the city's underworld begins to stir.

After a flight of fancy leaves Shotaro and Philip stranded in the mountains during a blizzard, they stumble onto a mansion that hosts a bizarre ritual.