Oogumi is a member of the "Funeral Parlor", who is an expert in the use of firarms and explosives and is a member of the Charlie Team.
He usually keeps things to himself and is very quiet.
He saves Shu from being attacked by a "GHQ" mecha and is later seen helping the rest of "Funeral Parlor" save the rest of the hostages that were captured by the "GHQ". He is seen helping Gai numerous times, such as when he helped destroy the building that Kido was being held in. He is killed by Seigai whilst buying time for Haruka Ouma to escape. His body is retrieved by Arugo. Tsugumi and Ayase mourn his death.