ecchi series authored by Hiroyuki Yoshino featuring art by Kenetsu Sat. It is notable for its violence, fanservice, and the use of breast milk as a central plot device. The manga is serialized in the shnen manga magazine Monthly Champion Red. As of now, the 24 episode anime adaption has ended on June 28, 2011 while the manga has ended on September 20, 2016.

I can assure you this. You will see boobs, boobs being sucked, boobs in varies of sizes. I have never seen this much of boobies in a Series that's actually Good!
YES! It's a good Anime Series!

When I first heard of this series, I thought: "What weirdo would wanna watch guys sucking women breasts to gain their superpowers!?"
And yea, I'm one of those weridos.

Either you like Ecchi, or you don't. So either you will enjoy this series, or get totally turned off by how absurd it can be at times, that you will not watch it.