Umi Nakano is an acting student and friend of Chizuru Ichinose, attending the same acting school. He typically presents a calm and collected demeanor, rarely displaying strong emotions, though topics related to acting ignite his enthusiasm. During a Christmas study session, Umi assisted Chizuru with script reading and helped her choose a gift for Kazuya Kinoshita; at that time, he directly questioned her feelings, asking, "You like him, don't you?" Umi later co-starred with Chizuru in the stage play "Aosagihime," portraying Yoshiharu, a shogun character who serves as the counterpart to her role of Rinko. He further supported Kazuya and Chizuru's independent film project by promoting their crowdfunding campaign on social media, amplifying its visibility through retweets.