The petalite board is created by Umasaburou and Kazuma uses it to create a recipe that kills three people. Of course they seem to have come back eventually.

He accidentally leaves it behind and Yukino finds and destroys it with a slegehammer in an alley and then gives the dust to some children playing in a sandbox in the park.

Ken questions one of the staff and learns that a tall woman (Yukino is tall) was seen leaving the room last.

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