Momoka is the female protagonist who embodies the goddess Sei. Her most outstanding quality is her infinite appetite as she often seen with food in her mouth; she is also comparable to a puppy with her very accurate ability to catch food in her mouth. She is very infatuated with Tōka and has a very bright personality compared to Tōka's gloomy attitude. Despite their differences, she isn't afraid to act on her feelings, which were later revealed to be deeper than just mere infatuation.
In the past, Sei was the one who killed Isamihiko when he became insane. It was also hinted that he had feelings for her.