At Kyra’s engagement party, she Slips into the past and witnesses a murder. Against her father’s advice, Kyra reports this to the Iron Watch. After uncovering a string of murders, she continues Slipping through time to find the serial killer.

The VOCALOID song "ECHO" with 8 million views has now been novelized! This song of madness from Crusher-P is weaved into a story in which the TV girl, or “Primadonna’s” identity is finally revealed!