Question Rose and Melancholy Rose Devourer

Cannibal Bouquet. That is rumored to be the curse of the witch Boojum.

After the passing of his foster parent, a youth named Seth moves to the royal capital, Alba, reputed to be a city of radiant colors, with the help of a friend.

He has a mysterious taste for roses and meets a craftsman on the train on his way to the royal capital. The craftsman, who cannot be identified as either he or she, clad in a bold crimson color, is obsessed with Cannibal Bouquet.

Lured by a dark-haired girl who lingers in his memory, Seth and the crimson craftsman are swept up with the Cannibal Bouquet.

This is a gothic horror mystery featuring a sweet fragrance in the city of radiant colors, where distorted roses bloom and sneer.