A male student is excited to spend the school trip that marks the end of his student life with his admired female teacher, Eriko-sensei. While strolling around the inn, he happens to see Eriko-sensei entering the women's bath. He calls out to a male student in his room and sneaks in to peek inside, where his eyes are caught by Eriko-sensei's voluptuous naked body bathing in the hot spring. The student is so excited by the beautiful body of his admired female teacher that he loses his footing and falls into the women's bath, but Eriko-sensei approaches him with a smile...