Ryuzaki, an editor of Muscle Magazine, which features photographs of men with sculpted bodies, becomes involved with a man named Kitami; their affair soon becomes dominated by sadomasochistic games, with a horrid result. Jump ahead one year, Ryuzaki is released from jail and goes in search of Kitami, perhaps to make amends.
Direction
Satō's voyeuristic close-ups make every frame feel illicit.
Cinematography
Sweat-slicked bodies shot like horror movie victims.
Acting
Itō's hollow-eyed desperation carries the entire runtime.

Director
Hisayasu Satō
Trivia, insights & behind the scenes
Part of Japan's 'pink film' tradition, Muscle represents the queer underground's emergence into exploitation cinema—Satō was reportedly inspired by actual bodybuilding subculture cruising.
The 58-minute runtime wasn't artistic choice; pink films were contractually required to fit double-bills. Satō weaponized the constraint into claustrophobic intensity.