Originally Posted by LordCha
I guess... Digital Devil Saga is one(or two) chapter manga, but I can't found.
Just letting you know, I don't think there is an "official" DDS manga [similar to the P3 manga that follows the game's story anyways].
That first book is a comic anthology; basically, a bunch of fanartists/writers come together, each write/draw their own short story/chapter, and it gets compiled together and published. In a way, it could be considered a doujinshi anthology too ^^;
I happen to have a DDS anthology book, but it's got 4koma [one-liner/4 panel] comics instead. See here:
That second one looks like an original fan manga story sort of thing [sort of like how SMT:Khan was an somewhat based off of SMT:If... Only hopefully this one doesn't suck as much ;>>] I don't own it, but you can find it HERE
for pretty cheap. It's called "DIGITAL DEVIL SAGA - Avatar Tuner - Shinen no Mato"