While still grieving and shocked by Suzumi's death and Ryo's simultaneous disappearance, Nao is told frankly that she will be attending school from now on. Confused, Nao stays holed up at home when Ritsuko and Aki come to her and say, "Let's go to a hot spring."

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.