Aggretsuko is an animated series featuring a red panda named Retsuko, who works in an office and struggles with the pressures of her job. She often expresses her frustrations through death metal karaoke, showcasing her dual nature as a sweet, mild-mannered employee and a fierce performer. Other key characters include Fenneko, Retsuko's sarcastic friend who provides commentary on their workplace dynamics, and Haida, a shy hyena who has a crush on Retsuko. The series explores themes of work-life balance, friendship, and the challenges of adulthood in a humorous and relatable way.