If you are engaging with this story or similar media, look for these common thematic progression points: Initial Resistance

It looks like you're referring to the localized title of an adult visual novel or eroge titled

Her goal was to become a more efficient, more productive, and more perfect partner and mother. She devoured books and articles on self-improvement, and she began to see herself as a project to be optimized. Her mental modifications were designed to help her better navigate the complexities of relationships, parenting, and domestic life.

It offers a radical break from everyday routines.

This is not mere mischief. It is calculated, intelligent evil. The capitalization of the 'L' suggests a proper noun or a brand of corruption. It implies a fall from grace—something once loving, now twisted into a parody of devotion. The "DiabolicaL" wife doesn't scream; she smiles while holding a kitchen knife. She speaks in your tone, uses your pet names, but her eyes reflect a different logic.

This is the heart of the community. "Modified" (or "Modded") games are original titles that have been altered by fans to include new storylines, improved graphics, or, frequently, uncensored content that was removed for mainstream release.

She wishes to scream, but only static comes. She wishes to bleed, but oil greets the blade. He calls her DiabolicaL ModifieD WifE — a trophy of brass and spite.