A written notice from Phantom U has reached Souffle Island,

where winds blow throughout the year. 

His target is the island's treasure, the Wind Guide.

Oshiritantei visits the island along with the Wankoro police,

and there meets the girl Lulu. who flies freely about in the sky.

She dreams of the world outside the island.

On the night of the full moon Phantom U specified,

Oshiritantei and the others try to protect the Wind Guide from him......

When Oshiritantei's famous deduction shines,

the secret hidden on the island will become clear!