After the hero saved the world and married his beloved princess, their happily ever after is repeatedly interrupted by monster girls who relentlessly pursue the hero to bear children of his heroic lineage. Rather than let her husband stray, the princess takes matters into her own hands by confronting each seductive monster girl directly, turning what could be marital conflict into a series of chaotic and comedic battles. The story is set in a fantasy world where the hero and his wife live in a castle, and each chapter typically features a new monster girl—such as an alraune, salamander, kraken, slime, arachne, or even a demon king—who tries to woo the hero. The wife, determined and resourceful, uses a mix of wit, magic, and brute force to drive away the would-be paramours, often with over-the-top and ecchi results. The narrative arc follows this ongoing cycle of attempted infidelity and wife-led intervention, blending slapstick humor, fantasy action, and risqué situations.