Young Ko is about to learn a new hobby...

Ko Higaonna, sharing a moment with his not-quite-girlfriend Satomi, is disturbed to discover a sallow-faced man watching with infrared goggles from the darkness. Ko's sense of privacy is offended, and soon blood is spilled, and the goggles pass into new hands. But the Voyeur remains, and now Ko is his pupil, about to discover what goes on beneath the smiles on people's faces... What goes on in private, in the dark...?

A murderous intent without form attacks the yakuza! In the declining yakuza society, the elites bridge the barriers between their organizations and hold a meeting to decide how they will survive as yakuza. In the midst of their excitement, the footsteps of an invisible pair draw closer, bringing the stench of violence with them!