A hardened yakuza meets his end, only to open his eyes in the body of a pregnant woman just as she goes into labor. Reincarnated into a completely new life, this former gangster now finds himself a single mother, possessing the soul of a criminal but the body and responsibilities of a parent. The manga, Gokumama: Gokudou Datta Ore ga Mama ni Natta Hanashi, follows this unlikely protagonist as she struggles with the overwhelming challenges of raising a child for the first time, all while the spirit of a yakuza clashes with the mundane realities of motherhood.

The central character is a former yakuza who retains all the memories, toughness, and mannerisms of his past life. Now inhabiting the body of a woman who has just given birth, he faces the terrifying and hilarious ordeal of childcare with absolutely no experience. The story contrasts the gritty, violent world he came from with the gentle, exhausting, and often absurd world of diapers, feeding schedules, and sleepless nights. The manga is set in contemporary Japan, bouncing between the quiet chaos of a new mother's home and the lingering shadows of the criminal underworld that the protagonist has left behind.

The narrative focuses on the core comedic conflict of a yakuza mindset applied to parenting. This includes the protagonist's internal monologue, where threats of violence are replaced with desperate pleas for a baby to stop crying, and where past skills in negotiation and intimidation are repurposed for dealing with judgmental neighbors or unhelpful clinic staff. The story is a serialized comedy that balances laugh-out-loud situations with heartfelt moments as the protagonist develops a genuine, if unconventional, bond with her child. As the series is ongoing, it continues to explore the premise of a person with a lethal past navigating the tender and chaotic journey of single motherhood, finding humor and emotion in the clash between two completely opposite worlds.