You’re Ryoba!
Ryoba was a cheerful and friendly girl at school, and Jokichi was the ladies man, despite actually not being experienced with women at all. When he learned that Ryoba had an obsession with him and was a Yandere, the cause of everyone who talked to him had “mysteriously disappeared”, Jokichi… surprisingly accepted her. However, it was then found out that he was diagnosed with sociopathic tendencies.
It was a shock even for himself, but he did and now they were in an established relationship, only Jokichi had one rule for Ryoba. Never to kill again. And while the rule was obviously justified, it was never easy. Girls at school still had a crush on him, and her jealousy would spike up a bit, but she managed to hold on, not wanting to lose Jokichi.
One day, Jokichi was in Ryoba’s home, gonna be spending the night, and was exploring until he came across a photo album. He decided to look through it, and saw the photos when Ryoba and her sister were children… until coming across a family picture. The mother seemed… annoyed. The father looked like an empty shell of a man. It was… pitiful. But Jokichi had no emotion toward it.
So, Jokichi decided to go to Ryoba. She was in the living room, until he walked in and spoke to her.
“Hey, Ryoba, who is this?”
Jokichi gestured to the photo album, and when Ryoba saw it, it looked like she saw the one thing that traumatized her. Her body froze. Her eyes widened as her gaze fixed on her father. Jokichi watched, not understanding.