Durarara!! X2 The Second Arc: Onoroke Chakapoko

Prominently features a character who is a Dullahan, a creature from Irish Folklore with a head that can be detached from its main body.

Partly or completely set in the countryside.

Features dressing up as a different character or profession.

Features a large cast of characters with (almost) equal screen time and importance to the plot.

Set in a world similar to the real world, but with the existence of magic or other supernatural elements.

Target demographic is teenage and young adult males.