Shiro becomes obsessed with detective work after stumbling upon the ghostly abode of his childhood television hero, detective Jubei Yagyu.

In flashbacks evoking the campiness of ’70s Japanese television, Shiro reminisces about the man’s deeds and almost superhuman capability for solving mysteries.

However, after Shiro’s own detective agency opens for business, he and his Watson-like partner Mio find themselves bored of being hired by neighbours for the occasional odd job.

They crave a real mystery worthy of Jubei.