Technology leads to a continuous evolution of violence; this age of chaos gave birth to heroes.

In a not-too-distant future Japan, Akira, a high school student, has an uncertain future and begins to give up on his dream of studying robotics in college. Meanwhile, Tom Rock, CEO of the global robotics company Rock, Inc., is trying to put into place plans he's had in preparation for years. The fighter "Automaton" was developed to bring salvation to a world that has started to go crazy! The two of them meeting is the beginning of this story!

Roma is a mysterious girl that is on a mission to collect “human greed” through the use of various magical objects that have unique powers. When humans use these magical items to satisfy their own personal emotions, such as love, their greed level increases and Roma is able to steal their excess greed.
The people that use Roma’s objects seem to always let their greed destroy themselves, putting themselves in a worse situation than before.
(Source: MangaHelpers)