While enjoying her school trip, Sunao is unexpectedly confessed to by a classmate she barely knows. Feeling down after hearing what he said, she is approached by Sato. Faced with Sato's frankness, Sunao confides in him about the feelings she has kept hidden in her heart. Meanwhile, Nao, who is making the most of her time in Fujinomiya, is excitedly suggesting a "pillow fight"—a must-do activity on school trips—to Mochizuki and Aki.