OVA
Description
Kotaro Miyao is a classmate and close friend of Haruo Yaguchi throughout their middle school and high school years, appearing from ages 12 to 16. He resurfaces at age 28 in the sequel series *Hi Score Girl Dash*.

Miyao possesses brown hair and blue eyes. His personality is observant, supportive, and notably protective towards Haruo. He often advises Haruo on relationships and shows visible discomfort during Haruo's interactions with Akira Ono and Koharu Hidaka. Miyao exhibits possible non-platonic feelings for Haruo, including jokingly threatening to kiss him to force an explanation about Ono—an action carrying undertones of seriousness. He also refers to Haruo possessively as "my Haruo," prompting confusion from Haruo himself. Although Miyao develops feelings for Ono, he consciously steps back to avoid disrupting her relationship with Haruo.

Miyao shares a complex dynamic with Koharu Hidaka. During their school years, he likely harbored feelings for her, though these remain unexplored. By *Hi Score Girl Dash*, working at a game company, he attempts to set Hidaka up with a coworker, an action that irritates her and reflects their strained connection.

His family background includes unnamed parents, older siblings, and younger siblings, though they remain uninvolved in the narrative. In *Hi Score Girl Dash*, his career in gaming and persistent, unwelcome matchmaking efforts concerning Hidaka demonstrate his continued presence within the original characters' lives.