Red Data Book

Red Data Book (レッドデータブック) is a manga written by Takashige Hiroshi and illustrated by Rokumoto Jun.

Plot
14-year-old Kimigawa Kento lives separated from his stepfather after his mother's death. A woman visits with a will, saying it's from his biological father. He refuses the inheritance, but she tells him the inheritance is approximately 1 trillion yen. He still doesn't want it, but when threatened with his friends and family losing their jobs, he agrees to meet his relatives.

But all isn't as it seems. When he arrives at the house, they are attacked and he finds out the true meaning of the will.