Gold Heart, Iron Will

Gold Heart, Iron Will is a Jujutsu Kaisen Female OC-Insert fanfiction featuring Toga Zenin, Naoya Zenin, Toji Fushiguro and Hajiro Zenin as its main protagonists. It follows Toga's romantic life.

Synopsis
Toga meets Toji at her father's funeral, calling him the first "monster" she ever met. She became somewhat curious about him but never tried to find him. She encountered him again and was awed by his violent, fierce and independent behavior. She began to fall for him, and he began to fall for her. Naoya Zenin, Toji's cousin and an acquaintance of Toga's, noticed, and realized he was displeased because he also held an interest in her. Just before Toji left the Zenin Family he and Toga slept together, unknowingly leaving her pregnant with an illegitimate child. Naoya was married to Toga soon after and kept Hajiro away from the two of them until caving 12 years later, allowing all of them to meet. 3 years later, Toga was assassinated, leaving the two in a state of grief and shock, thus enforcing Naoya's desire to become head of the family.