Not great.
I thought this would go into more detail about Aika and the thing that allows her to transform but while it kinda touches upon it it doesn't really give much in way of answers.
If anything this and the previous prequel just make more questions and problems for the original, like what happens to the new characters that have been introduced?
These prequels could have been their own thing separate from Aika and probably would have been better if they were.