Hm... there's quite a glaring problem with this: And it's even the format! (Which there are a few too many to list right off the bat.) It's the description. I get the feeling that you didn't want to actually write much to begin with.
See, here's the problem; what's exactly going on? It's not the characters I'm confused about, it's the battles, or more so the lack thereof. Which monsters did Diana start with? How close was she really to losing against Graphite? It feels like you've left me to make assumptions because you didn't feel like actually announcing what happened. That's very bad for an action story. (Which I'm assuming this is.)
Plot is very important to a story, but simply skimming over important sequences like battles which could be a life or death situation, that's just lazy.
I won't bother going into format style, because if you're not even willing to try writing the furthering of a bond between a trainer and his/her monsters through defending his/her life, the idea of changing styles would probably be too much to ask.
Keep trying, you can probably do way better than this if you focus. I hope to see improvement by your next update, but I won't be forcing you or anything.