Kuroki, a fellow researcher who worked with Haibara in the past, fell into a pit and find a lid. It seems human emotions like evil and greed are enclosed by the lid. Kuroki is urged by a grotesque monster named Mahler to open the lid.

Yuki washes up on a remote island where she finds the incredibly smelly monster Sedegan. As two lonely individuals, they grow close, but eventually it is time to part. After returning to the city, Yuki discovers that the compounds that make Sedegan reek can be used to make high quality perfume.