Momoji holds high rank within the Iga ninja clan during Japan's Warring States period. He operates from a hidden base featuring advanced, anachronistic technology, including a computer system used to monitor Oda Nobunaga's conquests across Japan. Through this system, he identifies Nobunaga's access to historically impossible weaponry like stealth bombers and automatic rifles. Recognizing these technological intrusions are altering history, Momoji reports the anomalies to a higher authority called the time control department, seeking guidance to address the disruption. After the near-destruction of Shishimaru's ninja team by the immortal cyborg enforcer Ginnai Doma, Momoji receives an alert confirming Shishimaru's survival and return. He later witnesses Shishimaru disrupt a strategic meeting by barging into a restricted room, mistaking another kunoichi for his fallen comrade Oyu. When clan members Kojiro Ryuzuki and Hayabusa criticize Shishimaru's impulsive behavior and low status after he departs, Momoji defends Shishimaru's capabilities and potential value. Momoji subsequently reveals that the spy Saburota gathered intelligence on Ginnai Doma's movements, information Shishimaru secretly overhears while eavesdropping. Momoji fulfills a strategic support role for the clan, coordinating intelligence gathering and resource allocation in their conflict against Nobunaga and Ginnai. His access to future technology and understanding of temporal disturbances position him as a pivotal figure in the clan's efforts to comprehend and counter the historical alterations threatening them.