RBK-061 Undercover investigator A requiem for the defeated Wedding bells that couldn't be rung

Carry out missions as long as you have life. You have to survive even if you are treated like a dog. That is the mission of an undercover investigator. Sakura accepts a proposal from her senior, Aoki, and decides to retire after a year. … This was supposed to be the last mission. However, this was the final mission for the two of them.