Daigo is a male student attending the same school as Ryo Sakaguchi, though in an adjacent class, identifiable by his auburn hair and blue eyes. He shares Ryo's identity as a fudanshi, a straight male with a strong interest in boys' love content. Beyond being a fan, Daigo actively creates and publishes his own BL doujinshi under the pen name "Daigo." He exhibits a sociable and entrepreneurial spirit towards his hobby, frequently selling his self-created works at events attended by Ryo and their mutual friend, Rumi Nishihara. To boost sales, particularly among fujoshi customers, he strategically recruits an attractive male classmate to assist at his booth, capitalizing on their tendency to imagine romantic scenarios between the two boys. Daigo shares a mutual friendship with Rumi Nishihara alongside Ryo Sakaguchi and expresses a clear desire to befriend Ryo, though Ryo often appears somewhat uncomfortable or hesitant around him.