Kamen Rider Kiva
Kurosawa was assigned by Maya to protect Taiga Nobori, swearing on his life that he would protect him, though he expressed worry about Maya's fondness for humans.
Kurosawa continued to guard Taiga and acted as an aid in Taiga's Development & Pioneer Company, being taskeded to eliminate any humans who may progress humanity. However, when he attempts to kill Mio Suzuki, believing she is going down the same path as Maya, Taiga fires Kurosawa and banishes him, threatening to kill him if he ever tries to harm Mio again.
The Moose Fangire later tries to kill the Tortoise Fangire as punishment for aiding humanity, only to be confronted by Kiva and shattered by Kiva Emperor Form with the Dogga Hammer in.
Kamen Rider Decade
When Natsumi Hikari was trapped within the changing dimensions during the destruction of the worlds, the Moose Fangire was part of a group of several Fangire which wrecked havoc.
The Moose Fangire was later among the four Fangires revived by Super Apollo Geist in the World of the Rider War and combined to recreate the Beetle Fangire. The Beetle Fangire is later destroyed by Kuuga's Mighty Kick.