Retsuko is an anthropomorphic red panda, 25 years old and single, who works in the accounting department of a Japanese trading firm. Facing constant frustration everyday from pushy superiors to annoying co-workers, Retsuko lets out her emotions by going to a karaoke bar every night and singing death metal.After 5 years of working the daily grind, her relationships with her various co-workers are starting to shift, and slowly begins to open up in ways that can change her life for better...or for worse.