Yahabe

Yahabe is a a one shot manga and anime OVA released by Hiroyuki Takei.

About
The oneshot tells the story about a young boy named Kamogawa Yosuke who meets a mysterious creature, known as Yahabe.

OVA
In addition to the one-shot manga chapter, a special CGI OVA was released as well, containing the same story.

Trivia

 * Even though it was originally only envisioned as a one-shot, Yahabe ties in to a later work of Takei's, Shaman King Flowers with the main characters from Yahabe appearing as major villains. However, Yahabe's name is changed to YVS/Yabisu, and his origins are seemingly changed as well.