Burn Up Excess centers on Team Warrior, an elite counter-terrorism squad within the Neo-Tokyo Police. The team includes Rio, who is perpetually short on cash; Maya, a firearms enthusiast; Lillica, a computer specialist; Nanvel, a tech expert; Yuji, a pilot with a habit of spying; and their enigmatic leader, Maki. They handle various tasks such as providing security, stopping robberies and arms smuggling, and protecting a powerful tank. Rio and her companions repeatedly foil the schemes of Ruby, an agent working for a secret coalition of influential figures. As the story approaches its conclusion, it uncovers the formation of Team Warrior, the deliberate reason for Rio's recruitment, and Maki's tragic history.