Sasayaku no wa Sono Yubi

One day, Hatsuki is hurt on campus and is helped by Watakabe Tatsuyuki, the most famous idol in school. Hatsuki secretly falls in love with Watakabe. However, Watakabe does not have any interest in Hatsuki until one day when Hatsuki finds out the truth about Watakabe's words: "I killed my little brother."

(Source: MU)