The Fortners adopted Johan and Nina after their biological parents, the Lieberts, were murdered. Things fell apart pretty quickly—Johan took off after just a few months, leaving Nina behind. The Fortners tried everything to find him, even running missing person notices in the local paper, but he was gone for good.
They'd originally planned to come clean about Nina's adoption once she turned twenty. But as that birthday approached, they got cold feet and decided to keep the truth from her instead, letting her go on thinking she was their biological daughter. It didn't matter in the end. On the night of the twins' twentieth birthday, Johan had the Fortners killed—he hired Detectives Messener and Muller to do the job.
Content compiled by AnimeList.moe from publicly available sources.
