Early Days Edit
Yuu used to play games with his childhood friend and crush, Koyuki Hinashi. One day, Koyuki left without even saying goodbye. As he grew up he always had the regret of not telling her how he felt about her.
Meeting Fuuka Akitsuki Edit
Yuu has just moved to Tokyo with his three sisters; Chitose, Maya and Hibiki, after their father moved overseas for a job, and their mother followed.
He first meets Fuuka Akitsuki after she ran into him and mistakenly accuses him of being a pervert when she thought he was taking a picture of her, breaking his phone.
Forming the Band Edit
Yuu Haruna as a bassist and also vocalist, Fuuka Akitsuki vocalist, Makoto Mikasa as a pianist/organ, Kazuya Nachi playing drums and Iwami Sara plays as guitarist.
School Festival Edit
Continuing the Dream Edit
In a bonus chapter of the manga series Real Account, it is revealed that he masturbates 24 times a week. As the rough draft for the special was submitted by Seo Kouji himself, this fact can be considered canon.