Wataru Amanogawa taught science at Juuban Municipal High School and was an accomplished astronomer who'd discovered a comet fifteen years earlier—which he affectionately named "Francoise," a choice that prompted the Inner Senshi to joke that he might be romantically attached to it. He'd apparently turned down an invitation to teach at Cambridge University to stay and work with high schoolers instead.
The comet returned on a fifteen-year cycle, and both Ami and Taiki had independently calculated when it would appear. Amanogawa invited his students over to watch it from his house. Taiki, who found the romantic mystique around astronomy annoying, initially declined the invitation—he believed science should be kept separate from dreams and sentiment.
The two of them appeared together on a children's TV show where Amanogawa hosted an episode with Taiki. When a kid asked whether dead people become stars, Amanogawa offered a measured "maybe, that's what some people believe," which Taiki shut down immediately and harshly, insisting it was scientifically impossible.
The night of the comet's appearance turned out to be stormy, but Ami showed up at his house anyway, hoping the weather would break. While she was there, Sailor Iron Mouse infiltrated the house posing as a girl named Chuuko Nezu, claiming to want an interview. She dropped the act, extracted what turned out to be a blank Star Seed, and transformed Amanogawa into Sailor Teacher. The Phage attacked Ami until Sailor Star Maker intervened. After some fighting—during which Star Maker used a half-powered Star Gentle Uterus to stun the Phage—Eternal Sailor Moon restored him with Starlight Honeymoon Therapy Kiss.
By the end of the chaos, the storm had cleared. Amanogawa and his students finally got to see Francoise.
Content compiled by AnimeList.moe from publicly available sources.
