For 25-year-old red panda Retsuko, stress is simply another aspect of her job, whether she is confronting misogynistic remarks from her boss or facing pressure from condescending co-workers. Even though she is one of the most diligent employees in her office, her small stature and modesty frequently result in her being exploited by her colleagues. Yet, when her irritation reaches its limit, Retsuko unleashes her distinctive method of releasing steam: aggressive death metal karaoke that attacks the idiocy and hypocrisy of her co-workers' actions and work life. Although this venting occurs only in her mind, it provides her with an outlet to counter her frustration in a world where hierarchy and appearances reign supreme.