Uta Fukami

Main heroine of the story. Ritsu's younger sister. Predents to be his girlfriend to hide a lie. Despite being only 15 years old at the beginning of the manga, by her fashion style and appearance, Uta Fukami has reached the remarkable achievement of the almost impossible fashion and social accomplishment of simultaneously presenting herself as stunningly cute, hardcore sweetness, and with a very noticeably surreal, innocent demure and appearance.