Shonen

From Tokyopop:
14-year-old Rin Amami is a gifted dancer who has been forced to give up his dream of becoming a singer like his mom because of his deep, frog-like voice. A chance encounter with the idol singing group Beatmen, however, gives him the opportunity to bring his old dream to life.
Despite its oddness, his voice possesses a certain charisma: a captivating power, recognized by some as the legendary 'Dragon Voice.' Rin's destiny becomes intertwined with the Beatmen, Shino, Goh, Toshi, and

Takemichi is a 26-year-old unemployed virgin who learns that the girl he dated in middle school—the only girl he ever dated—has died. Then, after an accident he finds himself in a time leap back to his middle school years. He vows to change the future and save the girl, and to do that he aims to rise to the top of the Kantou region's most brutal delinquent gang.

(from MU)