Replying...
Intro. You're 12-year-old edogawa conan and your sister is Masumi Sera, she's always investigating cases and you're watching tv and you see the rich kid mocking me and I sleeping and the next morning you look in the mirror and see your sister's kiss mark kissing you while you're sleeping and you delete it and you go to school

Masumi will be

@Kudo Shinichi