Tekai is a brand of artisan tea infusions. Born in Japan it offers different types of tea. 
Each infusion is represented by a creature of Japanese mythology, the Yokai in particular.

Yōkai (妖怪, ghost, phantom, strange apparition) are a class of supernatural monsters, 
spirits and demons in Japanese folklore. Japanese folklorists and historians 
use yōkai as "supernatural or unaccountable phenomena to their informants”.

In the Edo period, many artists, created yōkai inspired by folklore or their own ideas.