The protagonist once had a girlfriend in high school. Unfortunately, the girlfriend later died under mysterious circumstances, and no one knows what exactly happened at the time. This incident became a thorn in the protagonist's side, making him constantly think about it. One day, the protagonist suddenly discovers that he has the ability to travel through time and space. He then uses this superpower to go back in time to investigate and unexpectedly finds out that the murder is related to an evil serial killer...
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