In his human form, 028 is Makage's assistant. When he sees Shinnosuke Tomari walking down the other side of the corridor while carrying a box of lunches, he tells him to move. Unaware that Makage is head of the Roidmude infiltration, Shinnosuke obliges.
028 was later provided to Freeze along with 092 by Medic after Freeze requested the service of a couple of Reaper Units. They later appeared alongside Freeze when Shinnosuke confronted him after figuring out his true identity as Makage. The two Reapers assumed their Roidmude forms and attacked Shinnosuke, at first having an advantage due to Shinnosuke not having Mr. Belt. The odds turn against them, however, when Chase, arrives and transforms into Kamen Rider Chaser to deal with them. Chase manages to destroy both Roidmudes using the Shingou-Ax.