Sakuragi Ryo has a unique perspective on high school's social hierarchy, categorizing students into three groups: 'A' for the exceptional, 'B' for the average, and 'C' for the overlooked. Despite being thrust into the 'A' ranks in middle school against his wishes, Ryo is determined to blend into the 'B' ranks in his new high school for a quiet, unassuming life. However, his resolve is tested one fateful evening when he saves a girl from three delinquents, only to discover she is the most beautiful girl in school. As she offers gratitude, Ryo faces the challenge of navigating his newfound connection without drawing unwanted attention that could disrupt his carefully planned anonymity among the 'B' ranks.