The OC's name is Akina Hakari. Her quirk is called Mind Tricks and basically she created illusions only visible to those who respond to her questions. Kinda like Shinso's ya know? K let's star now!

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February 9th 2050,
My bed
Dear Diary,
Today, I met a very kind boy at school! His name is Hitoshi Shinsoand he's in class 1-C! The other general studies class. He seems really nice and we talked for a while. I felt happy during the time I was talking to him. I completely forgot about my boyfriend issues. My boyfriend, Fuji Suzuki, had started hitting me, and calling me useless. I'm scared he's going to break up with me but i'm trying to block out that those thoughts. 
                                                                                                                                                  -Akina Hakari

February 10th 2050,
At the dinner table
Dear Diary,
I walked to school with Shinso today! My day was going fine until I saw my boyfriend at the end of the day to go hug him. I probably shouldn't have because he shoved me off. And threw me into a wall. He walked up to me and punched me in the face. I screamed. He punched me a few more times before I heard those terrible words. 'We're done'. I started crying and I ran to the rooftop. No one ever loved and and no one ever will. Just as I took my shoes off, I heard a voice at the back of my head.

 'Hey! Don't do it, please'.

 I turned around but there was no one. I was about to undo my braids when I heard another voice. 

'Are you upset 'cause you can't have what you wanted? You're lucky that you've never gotten robbed of anything!'. 

That was true. So I thought that my life wasn't half bad. I put my shoes  back on, tightened my braids, and went home. I found a note on the dinner table. 'Hey Akina honey, I'm sorry me and your father left before you came home! We had an emergency at the hospital but we made you food! It's in the fridge so please heat it up before you eat it! Love, Mother and Father.' It was great. I heated up my food and ate with a big grin on my face.

                                                                                                                                                  -Akina Hakari

So this is really short-
Every chapter will have a few verses of the song in diary entry format.