Wataru Amanogawa was a science teacher at Juuban Municipal High School in the anime. He was an astronomer who had discovered a comet, "Wataru Comet," fifteen years previously. He had been invited to teach at Cambridge University, but declined in order to teach high school.
He referred to the comet that he discovered as "Francoise," as though it were a person or, as the Inner Senshi speculated, a girlfriend. The comet appeared every fifteen years, and Ami and Taiki both had calculated the moment of its exact appearance and were looking forward to seeing it. Amanogawa-sensei invited his students to view the comet at his house, but Taiki disagreed with the need for romance and dreams in association with science and originally turned down the offer.
Amanogawa-sensei made an appearance on a children's television show with Taiki as the host. One of the children in the audience asked if it was true that people became stars when they died, and Amanogawa-sensei said that some people believed that to be true, and it was possible, but Taiki angrily corrected him, saying that it was impossible.
The night of the comet's appearance was originally rainy, but Ami still went to Amanogawa-sensei's home in hope that the storm would clear up. While she was there, Sailor Iron Mouse came to the house in her guise as Chuuko Nezu and tried to get an interview with Amanogawa-sensei. She revealed her true identity and removed his Star Seed, but it turned out to be a blank and he transformed into the Phage Sailor Teacher. The Phage then attacked Ami, but Sailor Star Maker arrived and saved her.
Ami refused to let Sailor Star Maker kill the Phage, but fortunately Eternal Sailor Moon arrived. After Sailor Star Maker used Star Gentle Uterus at half its power, stunning Sailor Teacher, Sailor Moon returned Amanogawa-sensei to normal with Starlight Honeymoon Therapy Kiss.
During the fight the storm did clear up, and Amanogawa-sensei and his students were able to see the comet.
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