RDB :Red data book
Summary:14 year old Kimigawa Kento lives separated from his stepfather after his mothers death. A woman visits with a will sayings it's from his biological father. He refuses the will and she tells him the inheritance is approximately 1 trillion yen. He still doesn't want it and threatened with his friends family's jobs at the line 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.
Goodpoint: Interesting story,Amazing art,From the author of springgan and till death do us path.
I have edited your post, please do not link to unofficial fan translations.