Theseus no Fune

Synopsis

In 1989, the suspect of a mass murder by cyanide poisoning at an elementary school in Otousu village was arrested. The young man never confessed to the crime. 28 years passed. A young man named Shin visited Otousu, determined to investigate the case more thoroughly. When he arrived at what was supposed to be an abandoned village, he realized that he had been transported back in time 28 years, six months before the mass murder is committed. (Source: M&C! Comics - translated by Anime News Network)