Hanakaze Killer Tune

Kazune Ayu, a high school student who lost his dreams, regains his passion once again when he hears his classmate Aoha Hanamoto sing! Kazune, who once produced a hit song as a popular Vocaloid producer, is moved by Hanamoto's voice and recruits her to try and participate in the world's number one music festival, "WORLD SOUND." The two begin to walk into a reckless dream of becoming the number one in Japan in three years!

(Source: Shonen Jump Plus, translated)