Characters ( Part 1 )

My name is Ruka Akiroshi, also known as The Demon Reaper,I have a twin, her name is Riya Akiroshi, she is also known as The Heart Catcher but together we are The Nightmare Twins. So let's get to the point, the chief of the Nightmare Squad wants us to search for the goddesses because.......well, I don't wanna spoil the fun so, I would suggest to read this instead