Who would have ever thought that the most feared gangster of his time now spends his days as a modest househusband? Seemingly giving up the way of the yakuza, the legendary Immortal Dragon Tatsu, best known for his prolific skirmishes against rival gangs, has abruptly vanished. Unbeknownst to most, however, Tatsu is currently staying at an apartment with his wife, doing his best to live a peaceful life. Donning his trusty apron, Tatsu is now striving to become an efficient homemaker. Because of this, he has mastered the required skills—be it cooking the most delicious dishes, making sure to get the best deals at supermarkets, and everything in between—garnering the surprise of both of his former subordinates and enemies alike. Despite being a man with quite a controversial past, Tatsu's new way of life will only be more eccentric from here on out!

Some offices have stereotypical dynamics: the chauvinistic pig of a boss who never does any real work; the employees whose goal is to suck up to the boss; the ones whose lives seem perfect; and the individuals who have all the actual work pushed onto them. Retsuko the red panda is in the last group, as she stays late most nights to make up the work her coworkers are too lazy to do themselves. Her relief from the stress of her everyday life comes in the form of singing death metal at a local karaoke club. Night after night, Retsuko channels her grief into a microphone and considers the place to be her own personal sanctuary. But as she moves further away from her comfort zone and the ideas people have of her, she discovers that letting others into her world of death metal may not be such a bad thing.

Once a terrifying yakuza, Immortal Dragon Tatsu now continues to conquer the challenges of mundane life. While his beloved wife Miku works, Tatsu equips his trusted apron, takes care of their finances, hunts down the biggest store sales, and learns the way of a true househusband with the help of the neighborhood wives. Although Tatsu abandoned the life of violence, his former colleagues and enemies reappear around every corner—but this time only as rivals in homemaking ventures. Surrounded by a myriad of chores to occupy him, it seems that no matter how tough things get, Tatsu's undying perseverance prevails as he gives his tasks his absolute best.

Red panda Retsuko continues to work at her cyclic office job, with the occasional stress-venting via death metal karaoke on the side. With the company of her newfound friends Gori and Washimi, life is more enjoyable than ever before. But some new shake-ups to her status quo threaten to add more stress to her life. At the office, new employee Anai seems like a fine addition to the company. Yet when Retsuko is placed in charge of his training, she finds that beneath his steadfast dedication, he may pose a threat to the stability of the workplace. Meanwhile, at home, Retsuko's mother pays an abrupt visit, fully intent on having her daughter finally settle down and find a man. With this in mind, she sets Retsuko up for various marriage appointments, much to her chagrin. Now, Retsuko finds all the more reasons to head to the karaoke bar and unleash her furious diatribes. However, knowing that this will not truly solve her problems, she decides to make a more spontaneous choice to avoid her issues. And so, Retsuko finds herself set upon another self-reflecting journey, coming to learn more about herself and love, with the ever cathartic support of death metal karaoke.