Wife's Conditions - Serialized Version

This is a serialized version of "Wife's Conditions" that I previously posted as a short story. In a modern-style otherworldly otome game world, a rival young lady destined to become the Demon King takes the opportunity to push her fiancé onto the heroine, and it's supposed to be a story about the heroine becoming happy with her first love... However, it seems a bug has occurred because the young lady, who was supposed to be a villainess, is actually quite dark and has abnormal specs, and the first love interest is black-hearted and operates behind the scenes. Most of the characters are either operating behind the scenes or pitiful types. The hero and demon king elements are part of the setting, but they don't deeply affect the main plot. ※The young lady is not a reincarnator.