The Grandson Of Satan

Rj short for Rin junior was born on December the 24 and his mom shiemi has now been put in the hospital also he has twin lil sisters and one is in the hospital on the verge of death because Satan and rj now knows that he is the grandson of this monster all his life people have called him a demon for the things he has done. But the one person he hates before Satan yes his father Rin okumaru. What will he and his sister do when they found out the truth find out on the grandson of satan!!!