Tomoe Koga is a main character in the anime series 'Seishun Buta Yarou wa Bunny Girl Senpai no Yume wo Minai'. She is a second-year high school student who meets the protagonist, Sakuta Azusagawa, while experiencing a peculiar phenomenon related to puberty syndrome. Tomoe is characterized by her energetic and lively personality, albeit with a tendency to be self-conscious about her social status. Her story arc in the series revolves around her struggle with the fear of being ostracized and her developing feelings for Sakuta. She plays a critical role as both a friend and romantic interest for Sakuta, contributing to his growth and understanding of the mysterious phenomena surrounding them.