Burst Angel: Infinity

In Westland, New York, a murderer is killing people indiscriminately. A girl witnesses one of these murders, and the knife is turned on the helpless girl, who is shaking with fear. Meg returns to the town with Joe to celebrate the "birthday" of Shirley, who used to live with Meg. As orphans, they had decided that the day they first met would be Shirley's birthday. In the past, Meg had taken care of three little children, including Shirley, just before meeting Joe. The children were then adopted by a police officer named Sam, who possessed a strong sense of justice and was supposedly living happily with them. Meg and Joe help a person and receive a reward. They buy a present for Shirley with the reward money and go to meet Sam. However, they notice him acting strangely. Upon questioning him, he explains that Shirley was assaulted by a murderer and seriously injured. Joe tells the grieving and angry Meg, "Let's exact revenge on the murderer for Shirley."