Yukari Shikibu, an old school friend of Kōsaku Ogata, works as a Chinese language teacher and bears a distinctive X-shaped scar on one cheek. He shares a long-term romantic relationship with Masayuki Tsutsumi, spanning over six years; their stable partnership serves as a model Ogata admires and seeks to emulate. Ogata consults him for advice regarding romantic struggles with Takasugi, particularly concerning their competing desires to dominate the relationship dynamic. Yukari demonstrates protective instincts toward Tsutsumi, indicating deep commitment to their partnership. When Ogata and Takasugi take a trip to an onsen to resolve their tensions, he and Tsutsumi accompany them at Ogata's request to provide support. At the hot springs, he facilitates mutual understanding between Ogata and Takasugi as they navigate their vulnerabilities.