Kazuomi Ōga, a third-year student at Aoba High School, excels academically but struggles physically. He ranks among the school’s top male students in test scores yet falters in athletic pursuits, often facing difficulties in physical education classes. This stark contrast between his intellectual prowess and physical limitations earned him the nickname "Flashy Ōga," a nod to his distinctive school uniform style. Socially, he remains naive in romantic matters, frequently overlooking subtle emotional cues despite his popularity. His relationship with Rena Kariu began in middle school, marked by their matching ear piercings. As class representative alongside Chizuru Hishiro in high school, he interacts regularly with Rena but initially fails to recognize her feelings. Their dynamic shifts during summer vacation when mutual confessions occur, facilitated by Arata Kaizaki’s intervention helping Kazuomi acknowledge his own emotions. This moment transitions him from obliviousness to active pursuit of the relationship. Family challenges arise from his parents’ separation and his older brother’s NEET status, impacting household stability. Personal conflict emerges when Kazuomi considers distant universities without consulting Rena, causing misunderstandings. Guided by peers, he opts for Aoba University, reconciling with Rena and supporting his brother’s eventual enrollment in the ReLIFE program. Post-graduation, he marries Rena, who adopts the surname Ōga. As a married couple, they maintain ties with former classmates while his professional life remains unspecified.