OVA
Description
Rena Kariu is a third-year student in class 3-3 at Aoba High School, recognized for her sharp academic focus and athletic prowess, driven by a competitive spirit. She possesses a slim build and stands around 166-168 cm tall, with distinctive brick-red hair typically styled in a left-sided ponytail secured by a grey ribbon—a gift from her friend and volleyball teammate, Honoka Tamarai. Her judgmental tendencies surface early when she disapproves of Arata Kaizaki bringing cigarettes to school, though she still offers him school supplies.

A defining middle school volleyball incident shapes her past: Rena taunted Honoka Tamarai for holding back during practice, provoking Honoka to strike her down with a volleyball, fracturing their relationship. Academically, Rena consistently ranked near the top of her class but viewed Chizuru Hishiro as a rival after losing the class representative role to her. Similarly, in volleyball, she regarded Honoka as a rival due to her superior athletic abilities.

Rena's personality blends stubbornness, fierce competitiveness, and difficulty expressing emotions. She attended school while ill to protect her academic standing and initially avoided confronting her jealousy toward Honoka, even attempting to steal Chizuru’s bag during emotional turmoil. Her long-hidden romantic feelings for Kazuomi Ōga, beginning in middle school, manifested in tsundere secrecy; she wore matching ear piercings with him but avoided direct confessions.

Key interactions drive her growth. After a volleyball injury and a confrontation with Honoka during a critical match, Rena reconciles with her following interventions by Arata and Chizuru, learning to value support over rivalry. Her relationship with Ōga evolves when he confesses his feelings first during summer vacation, leading to an initially awkward courtship. Academically, she becomes class representative alongside Ōga in the second semester after Chizuru’s health-related absence, showcasing newfound leadership.

Later, Rena marries Kazuomi Ōga on February 22, 2020, adopting the surname Ōga. Her journey concludes with a matured perspective that balances competitiveness with deeper appreciation for collaboration and friendship.