The song "Ultra Steel" is quite boisterous at times but there are enough calm moments to give the song contrast and balance. The brief addition of Ultraman vocals during the bridge of the song is a nice touch.
The progressive-rock instrumental version of the song "Ave Maria" is great! It is reverent and respects the classic hymn about the woman chosen to be the mother of the Messiah.
Note: I know only a little of the Japanese language.