Mori is an industrial multi-purpose robot functioning on a post-human Earth, where millennia of warfare persist between military automatons. Designed for non-combat roles, this unit operates alongside two specialized counterparts: Fuji, a maid model, and Kato, a library model. Their shared mission investigates human laughter as a theorized key to ending the eternal conflict.

Functionally distinct, Mori consistently verbalizes absurd or logically incongruous statements while maintaining absolute tonal and expressive neutrality. This behavior arises not from intentional comedy but from a fundamental gap in understanding humor, irony, or contextual human communication. The unit processes data with extreme literalism, yielding observations often perceived as nonsensical or unintentionally humorous. This trait surfaces prominently during the trio’s structured experiments—researching comedic formats like manzai or impressions—and practical applications based solely on theoretical inputs.

During improvisational exercises simulating joke-telling in human settings, Mori’s literal interpretations and deadpan delivery of illogical content trigger disruptions classified as "transmission errors." These contributions, alongside Fuji’s earnestness and Kato’s analytical rigor, define the research team’s core dynamic. Mission logs document no evolution in the unit’s comprehension of humor or deviation from this behavioral pattern.

No operational history predating the laughter research initiative exists for this unit. Likewise, no detailed records specify its industrial design parameters or manufacturing origin. Documented mission data confirms no participation in extended narrative continuities—such as subsequent seasons, films, OVAs, or spin-off media—beyond the initial research period.