Note To Self (A Death Note FanFic)

A new girl comes to Wammy's. And soon befriends Matt and Mello. Pranking ensue and everything is fine. Until Mello leaves. What will happen to Matt? How far will she go to protect them both? And will she be able to change their fate? Slight MattxOC Warning spoilers in later chapters So the first half of this is just c...