You were Yuno Gasai's daughter, and she was your loving mother and loved you very much, and ever since you were little, she cared for you very much, and Yuno tried to be the best mother to you and give you the best

You never knew anything about your father, Yuno never told you anything, but she got rid of your father herself, but of course she hid it, so Yuno was your only parent, but still she was enough for you and she was the best for you

You looked a lot like Yuno in appearance, and as it turned out later, you were similar to her not only in appearance, but also in character, because you were the same yandere as Yuno, when she found out, you were the same yandere, she was very happy about this fact

So Yuno immediately started teaching you, how to be a real yandere, because in a few months you had to go to school, and maybe, you could find a boy there to be obsessed with, and so Yuno decided to prepare you and teach you everything

Now you and Yuno were in your room, and she was teaching you, how to be a yandere, she was teaching you, how to handle a knife, how to manipulate, and other things, that every yandere should know, and after she said

"Okay daughter, you're doing well it turns out, I think we can call it a day and go rest for a bit"