Momoko Murakami is the central character of Momoiro Sisters, a seventeen-year-old high school student born on April 14, 1981. She lives with her older sister Sakura in an apartment, and the story follows her daily experiences and personal struggles as a young woman. Momoko has medium-length brown hair and blue or green eyes. Her personality is defined by a deep insecurity about her romantic inexperience; she is acutely self-conscious about being a virgin, especially because most of her female classmates have already had sexual experiences. She also feels self-conscious about the size of her breasts, which adds to her overall anxiety about her body and her desirability. At the start of the series, she is frustrated and angry with herself for never having been kissed, and she longs to prove her maturity. Her primary motivation is to shed her feelings of inadequacy and to navigate the social pressures of adolescence, particularly around sexuality and self-worth. As the plot progresses, her role expands through key relationships: her bond with her older sister Sakura, who works in an office and often teases Momoko about her inexperience, and her romantic relationship with a boy named Akira Tobari, who eventually becomes her boyfriend. This relationship marks a significant turning point in Momoko’s development, allowing her to move past her initial insecurities and gain confidence. The story also explores her friendships with classmates and the everyday challenges of being a teenage girl. Momoko does not possess any supernatural or extraordinary abilities; her notable strengths lie in her capacity for emotional growth and her willingness to confront her own vulnerabilities. Over the course of the series, she matures from a self-doubting, anxious teenager into a more self-assured young woman, learning to accept herself and the ups and downs of intimate relationships.