Kyousuke's official girlfriend. She grew up without her father, who died in a car accident when she was 5 years old. She has attended all-girls schools since elementary school and grew up without socializing much, immersing herself in her passion for astronomy. Because of this, she thinks meeting Kyousuke was fate. She fell for him at first sight when he came up to her to chat for the first time and showed interest in her passion, but was initially wary of him because of her inexperience in dealing with boys. After joining the Koikatsu club and spending more time with Kyousuke, it became natural for her to stay around him. Despite knowing that Kyousuke sees multiple girls from the school because of his duty as the Koikatsu club's president, she confessed her feelings for him and they officially started dating. She is not against Kyousuke seeing other girls and getting physical with them at the condition that Kyousuke lets her know beforehand and doesn't see them in a romantic way. After graduating, they plan to get married and start a family. She's also very fond of Kyousuke's personal maids, Chiyo and Yukimi.