Retsuko is a red panda who works in the accounting department of Carrier Man Trading Co., Ltd. She had dreamed of working at a trading company and living the glamorous life of a Marunouchi office worker, but in reality she is at the mercy of her boss, who gives her unreasonable work, and her selfish colleagues. Unable to argue back, she vents her anger by singing death metal songs at karaoke alone. She made her debut in 2015.