"Look, what is beating 'bang bang' in my left chest is my living heart. 1/2 Of this heart belongs to conspiracy, power, and supreme power, and the remaining 1/2 belongs to you!" - Voldemort
In fact, to put it in one sentence, it is the process of an ordinary Muggle girl getting a diary, and then unknowingly trying to correct Voldemort and being corrected. Please don't be shocked by what I said above, because that's the feeling I want!