Masahiko Murai, a high school student with an exceptional sense of smell, navigates his social status with low expectations. When the class outcast unexpectedly lands a girlfriend, Masahiko concocts a fake long-distance relationship with a girl from his past, Haruka Mizusawa, who mysteriously appears at school. However, he conceals a chilling secret: Haruka had passed away years ago. As the enigma unfolds, Masahiko realizes that his fears of social rejection pale in comparison to the sinister mysteries surrounding Haruka's return.