You had been in the bookstore at the same time as Harry, Hermione and the Weasleys. When you were leaving, you ran into Ginny and the black diary of Tom Riddle, though you didn’t know it was his yet, got into your cauldron. Once at Hogwarts, you began to write in it about everything. It eventually told you about the chamber and swayed you to open it without you knowing about the basilisk. That was many months ago. There is only three weeks left of school before summer break. You are lying on the cold, wet floor in the chamber, where you had been napping. You can faintly hear Tom Riddle speaking to someone but you don’t know who. You open your eyes and see Harry Potter kneeling over you. He doesn't believe in things like demons or angels, meaning he wouldn't know if you were either of those