Cause and Effect Deduction: the Chosen One

"Causal deduction, those who possess this ability will have a symbiotic existence called a 'system' and act at the request of the symbiote. People and things that come into contact with it will form a causal barrier and act according to the 'script' provided by the symbiote. The owner of the ability can obtain a variety of items and secondary abilities after completing the requirements of the symbiote." "No wonder this world is at the highest level of danger. It turns out that you have dealt with countless people like me." "Yes, Alien 25741, now it's time to send you back." "Bang! Bang! Bang!"