There was a place named Eir'Cre where all living creatures/races, such as elf, angel, devil, goddess, etc, could live together. But that was the old Eir'Cre. Everything changed when Eir'Cre's treasure, Kuroshiroi Diamond, mysteriously went missing. That diamond represented 2 major races, Angel and Devil.

Eir'Cre now has 3 major parts. First part is for the Angels, 2nd part is for the Devils, and the 3rd part is a free area. It is where these two live. In this place, there is one important rule for both sides, "to kill or to be killed".

"She is a devil, I should kill her…right? But why did I protect her?"

"He is one of the angels, the clan that killed my parents….I suppose to hate him, right? But why my heart is really noisy every time I see him?"

What will happen to these two? An adventure that will reveal a big mystery about them is also waiting for them. Can these two and their friends change the situation between Angels and Devils?