This manga sets out to do one thing. Be a borderline porn. And it does it well.
Basically, some people are able to bend certain metals to their will and to do that they use this....liquid which is essentially mana. Guess where that mana comes from? That's right! Anime tiddies. Bottles are overrated so they suck it straight from the source. That's it, the rest doesn't matter.

If you're looking for manga, with decent art, that has ungodly amount of tits in it with nudity and a couple of superpowered fights sprinkled on top of it, this is what you're looking for.
If you require decent writing, plot and character development, avoid this like your sick neighbor in 1350's Europe.

Oh yeah, it also has anime adaptation, it's....exactly what you would expect it to be like. A good ecchi series.