Kazuichi Arai

Serving as the temporary homeroom teacher for the main group, this baseball-loving coach is affectionately known as Pin by his students, though the polite Sawako still addresses him formally. A passionate enthusiast of the sport, he previously played in the same league as Shouta’s father, fostering a long-standing connection to Kazehaya. Known for his habit of playfully interrupting others, he also shares a special bond with the group's puppy, whom he nicknamed Pedro Martinez.