Not too long ago, The story follows a High School student living in Kyoto, Japan, Katsuya Ken. He was average in studies and sports. He actually didn't have any friends to talk and chill with. He led quite a sorrowful youth. In spite of the fact that he was ignored by his classmates and teachers for being a weird type of guy, he didn't care about all these stuffs, but he always ends up getting depressed at the end of the day. However, one of his interests was watching Mystery and Thriller shows. He used to often go for cycling at the evenings and watch the sunsets sitting near the Rivers. One day he found an old watch covered with moss and dirt lying on the river side, and that's where the story begins.