Second year Lee Taemin has suddenly found 2 lost notebook. As he reads the stories and corresponding pictures, he must try to help this student, And work against time to find and help this lost student. Before he, or she commits suicide.   

Onew looked at the sea,, The last thing she saw. Why didn't you just tell me? He asked The answer came right back at him. Because I wanted your first love to be better than mine.