An accident during tests of an anti-plasma artificial magnetic shield at Japan's Ground Self Defense Force East Fuji practice range sends the 3rd Special Experimental Company, under Colonel Matoba on a time-slip 460 years into the past, into 'the Age of civil War'. At the same time an imaginary-number anomaly thought to be caused by interference from the past begins eroding the present.

Kasaki the hitman needs to set scores with his target Ri after the syndicate hunts him and blackmails his childhood friend to kill him.

Zenigata Rai is tracking down Detective Okano, who disappeared in the "Forest of Golgoda" in Akasaka, Minato Ward. However, she also gets involved in an incident and goes missing. Rai's cousin, Zenigata Rei, joins forces with Detective Matsuyama, who was once Okano's partner, to investigate the two cases.