Mao was engaged to a breunette blonde, Australian woman name, Sophia, they had to put their wedding on hold mutiple times due to money issues, during this Mao had joined 2fort hoping to finally get enough so he could give Sophia her dream wedding.
While at 2fort he was assigned a student, Maria, as a year passed Mao had introduced them to each other, they quickly formed a mother and child like bond. The three of them would spend most ceasefire days together, but as time when on Sophia couldn't help her growing curiosity about Maria's Rosaro, leading to the day she accidentally activated it, at this time Maria had no control over it.
It was around three thirty a.m. when Mao heard the faint sound of crying coming from his lab, as he entered his lab he was met with the sight of Maria holding Sophia's mangled corpse on her lap, Mao rushed over to them but no matter what he said Maria would just reply "I-I'm so sorry... I... I didn't m-mean to..."

Mao locked Maria in his lab for weeks trying to help her control it, mutiple times it ended with her destroying parts of his lab and harming him. During this time he barely sleep, spending all of his time studying and helping her. Late one night he had Maria active her Rosaro, she had completely lost control, she destroyed Mao's studies and tore the back of his left leg open, Mao quickly restained her until she was finally able to control herself.

I think the story is awesome and quite creative :D