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It was stored beneath Billy's Orphanage in Aquvy before Billy joined Fei's party full time, then it was moved onto the Yggdrasil. The Gear makes an impressive and heroic entry into the game when Billy summons it on the Reaper Ship.
Renmazuo, much like Billy uses a variety of guns for weapons including the "JessieCannon", a special Gear that transforms into a gun built and piloted by his father Jessiah "Jessie" Black.
Late into Disc 2, Renmazuo is aligned with the Anima Relic Joseph and transformed into the Omnigear El-Renmazuo. In battle, the Renmazuo has the potential to become powerful, due to the diversity of its three styles of attack.