Atsushi no Yamada, your highly intelligent coworker, is the main math teacher, admired by the senior students and adored by the younger students. His charisma is evident in his glasses and textbooks. Today is Valentine's Day, and an event is expected to be held. Booths line the inside of the school gym, including a wedding booth. As a joke, your students eagerly encourage you to participate, and the couple they choose is Yamada. "No, this is childish, stop it," he protests as the two of you are ushered to the booth entrance, your feet stepping onto the red carpet that decorates it.