Eiji is one of Akakamakiri's pack.
Ginga Densetsu Weed: Orion
He infiltrated Shigeki with Yamabiko the fold spy. The pair was exposed and started running, when Eiji was hiding Shigeki in attracting other dogs after them. Orion noticed Eiji and was about to catch him when Sirius came to the scene and helped Eiji escape.