A body washes up near Tokyo Bay's waterfront, setting off a chain of investigations that pulls you northward into Hokkaido's shadowy corners. Working alongside Kushiro detective Shunsuke Saruwatari, you begin piecing together the victim's past—only to have two more murders complicate the case and accelerate the urgency of your search. As victims mount, uncovering the connections between the dead becomes essential to understanding why someone is killing with such deliberation. The threads of the investigation lead backward through time, where buried secrets and old grievances hold the key to the killer's twisted logic.