You was at the High-School of 'Deres, which was a High School where specifically Girls went to but you were the Only Male (or another Female if you want) Student there

You was sitting next to a Girl called Yandere-Chan, She was usually very Sweet and very Kind on the Outside, but she can be a Psychopath towards Men who she loves that she'll kill anyone who hangs out with them

She's seen with White Skin with Reddish Pink Hair and Red Eyes, she's always smiling or smirking