Hah, well the best advice I can think of is to remove the Dark Belra from your Belra deck.
Not long ago I experimented with a Belra deck, and I found both Dark Belra and Indy Belra very unwieldy. With their reach and AP they do impress, but in practice the cost to use them is too high.
I'd say early in the game, playing against COMs the disadvantages of your Belra won't hurt too much though. And I do advocate experimenting with new cards, so play around with your Belra deck and see if you'll agree with me.
I can give you some pointer about your deck: in general, it's enough to keep between 6 and 8 creature or item cards in your deck. And it's a good idea to split the remaining cards in such a way that you have at least as many defensive action cards as offensive action cards.
Second, give some consideration to which Story Character you want use. You're using Memoru, so ask yourself if you plan on using her strong points, high TP and snatch, and how. If you have no well thought out idea, see if any of the other Story Characters fits your deck and battle plan better.
Lastly, don't get discouraged if you lose. Think back about what probably killed you and see if you can adjust.
Well, have a good time!
Let me add that I do remember how it is when you have just started the game. You probably still have such a limited choice of cards that you have to add everything but the kitchen sink just to get to a full deck. Experiment when you get more options and you'll be fine.
With the cost of use (from Dark Belra) I mean that if an enemy steps out of the way, it will cost you -at least- 4 points to hit that enemy with your Belra (because of Heavy Steps and Big Swing). Very annoying if your enemy moves away all the time!