Pure Japanese

Tateishi works behind the scenes handling sound effects for ninja shows because he is haunted by a traumatic accident that occurred on a film set in the past. The memory of this incident resurfaces during tense moments and has made him fearful of performing violence himself, even though he possesses exceptional physical abilities.

His daily shrine training and strict physical discipline hint at abilities he keeps suppressed.

The PJ kit is a device that claims to measure the "purity" of Japanese people. Saeki uses it at the party to gauge people's Japanese heritage, getting a mediocre 50% result. When Tateishi later takes the test at home, he scores 100%, which is presented as a shocking moment that challenges his self-perception and his relationship with identity and Japanese culture.

The device appears early in the film as a comedic but unsettling plot device.

The film presents Tateishi's 100% result as a bizarre and unsettling twist that raises questions about what the device actually measures and what it means to be "pure Japanese." The moment marks a psychological turning point for Tateishi, making him reconsider his own identity and his connection to Ayumi, though the film leaves the exact implications ambiguous.

Tateishi's strict adherence to Japanese cultural practices and shrine training foreshadows his high score.

When Tateishi steps in as a replacement performer in the ninja show, he is unable to execute violent actions because his past trauma from the film set accident resurfaces, overwhelming him. His fear of repeating the violent incident from his past prevents him from performing, causing him to falter on stage in front of Ayumi, whom he wanted to impress.

His daily training at the shrine and his choice to work in sound effects establish his reluctance toward real violence.

Kurosaki is a prefectural assembly member who secretly colludes with the Nagayama-gumi yakuza group and a Chinese broker in a scheme to sell the land where Ayumi lives with her grandfather Ryuzo. He orchestrates the harassment against Ayumi and her grandfather to force them off the property so the land can be sold for development.

The yakuza approach Ayumi at the party to enlist her help in persuading Ryuzo, establishing the political corruption behind the plot.

Ayumi affirms Tateishi's destruction of Kurosaki's office because she has witnessed the relentless harassment her grandfather suffered and the corruption behind it. For the first time, she sees his violence as a justified response to the unjust persecution they have endured, validating his actions as necessary rather than reprehensible.

Earlier interactions show Ayumi growing frustrated with the yakuza pressure and desperate to protect her grandfather.

Tateishi's final violent outburst is triggered by the combination of Ryuzo's death, the yakuza's intensified pressure to seize the land, and the arrival of heavy machinery to begin excavation on Ayumi's property. These escalating threats push him to finally unleash the violent impulses he has suppressed throughout the film, leading him to storm the site and confront the attackers.

His destruction of Kurosaki's office and subsequent dismissal show his breaking point approaching.

Ryuzo's death removes the last obstacle for the yakuza and intensifies their efforts to take Ayumi's land, leaving her vulnerable and desperate. The loss deepens Tateishi's emotional investment in protecting her and pushes him closer to his breaking point, as he can no longer contain his violent impulses in response to the escalating threat.

Ryuzo's injury and hospitalization already signal the growing danger before his death.

Tateishi refuses to participate in the PJ kit test when Saeki forces others to take it at the party, likely because he views the device as arbitrary or offensive, or perhaps because he senses the uncomfortable implications of being judged by such a metric. His refusal distinguishes him from others who submit to the test, setting up the later revelation of his surprising 100% result.

His earlier distance from others and his serious, eccentric demeanor suggest he does not seek external validation.

The film ends with Tateishi unleashing violent confrontation against the yakuza and attackers on Ayumi's property to protect her, but the final outcome remains ambiguous. The summary describes this climactic surge of action without specifying whether Tateishi survives, is arrested, or what becomes of Ayumi after the confrontation, leaving their fates uncertain amid the destruction.

The steady escalation of violence throughout the film builds toward this ambiguous climactic moment.