[Based in an alternate reality] 6 strings (depending on their colour) determine the relationship between people. Whether it'd be love, lust or friendship. A new girl moves into town and is interested with the science and history behind the "Strings of fate". She is willing to find out more about it but along the way, she bumps into 4 different boys on a set of several occasions and as of that, reveals her relationship with them as well as the boys themselves and their relationship with her. The further she digs into the world of strings, she finds out a dark background about the strings and why they exist.