In Mix S2 Episode 5, a mysterious man with memory loss becomes a central figure. The episode begins with Otomi, Touma, and their friends organizing a birthday party for Haruka Ooyama. Amid the preparations, Otomi encounters a homeless man who saves her from a possible car accident. It turns out that this man, later known as "Punch," suffers from amnesia and has been staying near Meisei High School.

When Otomi and her family decide to take Punch in, they learn that he has no recollection of his past life. Surprisingly, Punch wins a million yen in a lottery, raising questions about his history and suggesting he might have a streak of luck. Despite his unclear memories, Punch seems to have a strong connection to Meisei High School and shows great interest in the baseball team.

Over the course of the episode, the characters form a bond with Punch, especially Otomi. She feels indebted to him for saving her life and believes he must have a good heart. At the same time, Touma and Otomi struggle with the decision of whether to involve the police to help Punch find his family or not.

In a surprising revelation, Punch mentions remembering a café near the school, hinting at a deeper connection to the place. By the end of the episode, it becomes clear that Punch's presence will significantly influence Meisei High School's baseball team and the lives of those involved.