"For some reason, I can see red string attached to people’s little fingers."
"Apparently, this string connects the people who are meant for each other."
"But I never saw my own thread. Its as if it doesn't exist at all.”
"Maybe, there wasn't anyone meant for me."

You play as the protagonist Yua, who after a mysterious accident which caused him temporary memory loss, finds out he can see the red strings of fate. But many questions are on his mind: Why can he see them? Where is his father, whom he last remember seeing before the accident? And why is he unable to see the string on his own hand; is it invisible to him, or simply because it is not there at all?

[From official site]