Minami Tenjin is the most popular and admired student at Seishun Academy, known for his athleticism, refined appearance, and consistently kind attitude toward everyone regardless of social standing. Beneath his approachable exterior, he carries the weight of a past unfulfilled romance with an older woman, an experience that has made him cautious about entering new relationships and has shaped his mature, grounded perspective on love. In the Marriage Practical program, he is paired with Shiori Sakurazaka, while Akari Watanabe initially harbors a strong crush on him. Rather than acting as a typical love interest, Minami serves as a catalyst for the main characters' growth. When Akari confesses her feelings to him, he tactfully turns her down and helps her realize that her genuine emotions have shifted toward her practical partner, Jiro Yakuin. He also acts as a mentor figure to Jiro at various points in the story, offering guidance from his own experiences. His role in the narrative is primarily to encourage the central pair to pursue their authentic feelings, and his personal arc involves coming to terms with his own past heartbreak, which ultimately allows him to support the happiness of those around him without bitterness.