In a flashback to Rio's days before joining Team Warrior, Maki first meets Rio working behind the counter in a convenience store to earn extra money for her debts. Maki witnesses her fighting skills as Rio takes down a thief who's trying to rob the store. After putting Rio through some tests, Maki asks her to join Team Warrior, but Rio refuses. However after Rio rescues her fellow officer Miyuki in a hostage situation, the reward money convinces her that Team Warrior is the place for her.