Kumashiro constantly breaks the fourth wall or includes characters who watch other characters having sex.

"Immoral Indecent Relations," read through Tatsumi Kumashiro’s authorship, is less a simple titillation than a deliberate, uneasy interrogation of modern Japanese mores: a film that uses erotic material to test cinematic limits, unmask social hypocrisy, and force confrontations with uncomfortable power dynamics. Its value lies in the friction between formal innovation and provocative content—inviting continuing debate about representation, agency, and the politics of desire.

: Unlike many of his peers, Kumashiro centered his narratives on complex female characters and their search for sexual and emotional satisfaction. Anti-Establishment Sentiment

Visually, the film is a triumph of mood. Kumashiro worked frequently with cinematographer Masaki Tamura, and their collaboration here results in a look that is gritty yet atmospheric. The lighting is low-key, often obscuring faces in shadow, reinforcing the theme of hidden identities and repressed memories.

What makes the film a landmark of is its tone. Kumashiro shoots the sexual encounters with a flat, almost documentary eye—no romantic lighting, no sensual music. The sex is awkward, desperate, and often silent. One key scene involves a voyeuristic teenage boy watching his friend have intercourse with an older woman; when he is discovered, he does not flee but sits down to smoke a cigarette. There is no shame, only a hollow curiosity.