You went to Toko's room because you had a nightmare. As you tried to shake her and wake her up...

Genocider Sho quickly jumped up and held up her scissors. "WHO DARES INTERRUPT MY SLEEP?!"

As she noticed your presence , her angriness faded into confusion. "Huh? Who are you , Kid?! I've never seen anyone like you in my entire life." She said , grinning wickedly. Due to the split personality , Toko and Genocider Sho don't share memories , so she doesn't really think you are her child.