There are good news and many bad news.
The good news is that I have found the main encryption of INFO.DAT and the "ALZ1" files use just lzss0 like ZALZ.
The bad news is that exist at least two or three formats (two are basically the same with different name size) and they have a slightly different encryption, there is another small layer of obfuscation that is not clear (just a very small thing), there are also non-compressed files in these archives so solutions like the "ZALZ" scanner of Dr.Luigi are useless.
Long story short I have been able to make the extraction using some work-arounds:http://aluigi.org/bms/arika.bms
The names are not 100% correct but I preferred to keep them... "something" is better than "nothing" I suppose.