@criver yea it's basically a "monster of the week" manga, with a lot more edge.
I can enjoy that too, the problem is how irredeemably evil the characters are, they are flat with no redeeming features like i'm all for evil scientists doing things for the greater good, losing sight of the good on the way.
Or simply one that does this horrid stuff because they want to perfect something and don't care about the cost.
These guys are neither, they don't have any grand vision or real drive, just doing evil because it's evil, it will get stale real quickly unless the "hero" can make things interesting, so a lot of weight in this manga is placed on the performance of the "revenge" rather then the actual characters that get it, it would be a lot better if it could do both but i didn't check this manga out expecting a masterpiece either so i guess low expectations mean I'm more forgiving for it's flaws.