OVA
Description
Mika Nogizaka is Haruka Nogizaka's younger sister, a second-year junior high student standing 147 cm tall from an affluent family. Her personality stands in sharp contrast to her older sister's naïve and airheaded nature; Mika appears more stable, proactive, and genre-savvy, frequently taking deliberate meddling actions to steer events.

She often teases Haruka and Yuuto Ayase, especially when they are together, showcasing her mischievous and observant streak. Mika holds a strong fondness for Yuuto, affectionately calling him "onii-san." Despite her confident exterior, she exhibits a pronounced fear of ghosts and reacts strongly to explicit adult material, becoming mentally stunned upon exposure.

Her hobbies include playing the violin, playing squash, and caring for wild pigs. Mika is also known for spying on Haruka and Yuuto, frequently aided by the family maid, Nanami Nanashiro. At her all-girls junior high, she enjoys significant popularity and is idolized as "Moonlight Strawberry." She has campaigned for student council president in back-to-back years, highlighting her leadership ambitions and peer standing.

Throughout the series, Mika actively intervenes to advance Haruka and Yuuto's relationship. She stage-manages a date with Yuuto under the pretense of coaching him on romantic approaches toward Haruka, demonstrating her proactive investment in their dynamic. Her role includes familial support, such as explaining Haruka's traumatic past experiences of ostracization after her otaku interests were exposed in middle school, leading to Haruka's school transfer. Mika also collaborates with household staff during crises, like devising countermeasures when their father confronts Haruka about her hobbies.

Her interactions often involve comedic or strategic elements, like becoming jealous when Yuuto’s attention shifts during their outing or getting distracted while assisting surveillance. Physically, she is characterized by features like pigtails and a snaggletooth, aligning with her lively persona.

Mika maintains a consistent presence across series installments, including the Finale OVA, where her actions help resolve key conflicts affecting Haruka and Yuuto's relationship. Her knowledge of social and romantic matters exceeds Haruka's, though she remains within age-appropriate boundaries, balancing mature insights with moments of adolescent vulnerability.