Kawasemi Omito, a supremely skilled detective, leads a joint investigation into a serial killing case. Amamiya lends him Toto, whom Kawasemi deems so useless he's invisible. Ron appears at the newest crime scene as a consultant, irritating Kawasemi.
Oh, I know! It's kelp!
!وجدتها! عشب بحر
Ach so! Seetang!
¡Ya sé! ¡Son algas!
¡Ya sé! ¡Son algas!
une algue, bien sûr !
Ma certo, è un'alga konbu!
Ah, já sei! São algas!
Ну конечно! Водоросль!
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