Implicating kagerou_imaizumi → touhou
Link to implication

Reason:

Kagerou is a Touhou character.
Existing Implication is for an old tag (imaizumi_kagerou) now aliased to this one.

EDIT: The tag implication kagerou_imaizumi -> touhou (forum #282951) has been approved by @bitWolfy.