Fumiya, an office worker in his seventh year of marriage, loves his wife deeply but is secretly troubled by his inability to perform during their intimate moments. The couple also faces relentless pressure from relatives due to their lack of children. Their already strained life is shattered when the government suddenly intervenes, forcibly separating them from each other under a radical new policy. Framed as a measure to combat Japan’s declining birthrate, this state-sanctioned program mandates that married couples must cohabitate with new assigned partners, effectively legalizing infidelity for the sake of genetic compatibility and reproduction.

The narrative follows Fumiya as he is torn from his wife and thrust into this controversial living arrangement. The story explores the immediate emotional fallout and psychological distress of being ordered to form a new physical relationship with a stranger. Early developments depict Fumiya’s wife engaging sexually with her assigned new partner within the first few chapters, adding to the protagonist’s humiliation and despair. As the series progresses, it delves into the complexities of loyalty, desire, and societal pressure, examining how this government-mandated experiment impacts not only the forced participants but also their understanding of love and marriage. The setting is a contemporary Japan where the government has assumed extreme control over personal relationships, creating a dystopian backdrop for a story focused on adult drama and erotic tension.

The main characters are defined by this forced disruption. Fumiya is the central protagonist, a husband whose feelings of inadequacy and love for his wife are thrown into chaos by the government’s decree. His wife is a key figure whose actions and choices under the new law serve as a primary driver of conflict. The new partners assigned to them act as catalysts who shatter the existing marriage, with the narrative focusing on how all parties navigate the boundaries of fidelity when those boundaries are officially erased. The author is Nikumaru, known for the series Someone’s Girlfriend, and the manga is serialized in Weekly Young Magazine, targeting a seinen demographic with its mature themes of drama and erotica.