Fate - Return by Death, A Path to Misery

"What is going on?" Subaru Natsuki, a Japanese boy who somehow brought into a fantasy world asked. It's not because he was brought into a fantasy world. It's because the setting is different. His ability allows him to return to a certain point in the past. The first three walkthroughs were similar in details. However, for the fourth time, things start to get messy.