Seeing that there isn't a txt File (I forgot to add in the txt files on how to disable the AI and enable fullscreen for the game) here is a simple way to disable Myuki's AI.

Step 1: Go to the chars folder in the Anime Battle Stars folder. From there scroll to Myuki Shiba and click on her folder.

Step 2: Open her def file (Make sure you open with either notepad, Notepad++ or Visual Studio Code)

Step 3: In the str section remove str 5 Which is her AI cns and it should be disabled.

Hope this simple tutorial helps out for you! If need in contact for further information or help email the Creator mugen_master335 at nightmaremaou33@gmail.com