Yako finds a body cemented into a wall, with a ponytail showing. Thanks to Neuro's radiating demonic power, the body partially develops sentience. Neuro hires the hair, who calls herself Akane, promising he will solve the mystery of her murder. Yako later attends a comedy show where members of the audience begin randomly dying of what appears to be laughter. With Akane's help, Neuro discovers that the murderer is a stage assistant of the comedian who killed the members of the audience by freezing poison into ropes on the ceiling and dripping it into the audience's bentos.