With a lot of buzz surrounding a pair of teachers, Moriya and Kimura, who recently got engaged to each other, Hibiki comes across the ghost of a young girl who appears to be losing her memories, meaning that she won't be able to pass on if she forgets her lingering attachment. As Hibiki and the others spend time with her, they find she has some connection to Moriya. While Hibiki has Moriya spend some time with the ghost, the others learn from Kimura that the ghost was a sickly girl Moriya was friends with when he was hospitalized as a child. Later that night, after Hibiki gets a glance of her memories, the ghost, having fulfilled her promise of meeting Moriya again, gives her farewell to him on his wedding day and passes on.