Board Thread:Questions and Answers/@comment-32556318-20170712153049/@comment-25942629-20170712221826

We know Yu's parents were abusive. It's implied his dad tried to stab him. We know his mother tried to burn him in his home and then set herself on fire since that's when Saito rescues him. We also know Yu's mother isn't his biological mother, but we don't know about his dad. We have very little information on his origin and young childhood at this point in time.