Retsuko stops performing the version of herself the office expects and starts tearing into the rot that keeps her trapped there. The show finally admits what made seasons 2 and 3 drift: you can't metal-scream your way out of actual corruption, layoffs, and a system designed to burn you out. Back in the cubicle where it hurts, watching her choose between survival and self-respect, the comedy stops being cathartic and becomes real.

Retsuko the red panda still works a thankless office job and still blows off steam by screaming death metal at karaoke after hours. Having joined an underground idol group to clear her debts, she now leaves OTMGirls behind, hoping for a happy, ordinary life. Things refuse to stay quiet, though: her company is heading into major changes, and her relationship with Haida at last starts to progress. This ten-episode comedy mixes workplace slice of life with musical outbursts.