芸術、スポーツ、 音楽とあらゆる分野の若い才能が集まるスカイストリート。
そこには、通称「ヨゾラ」と呼ばれる各才能に特化した4つのチームが集まり、 独自の街の様相を築いている。
ある夜、 スカイホールの大型ビジョンが突如激しく輝いた。
見上げた4人の頭上に無数の蝶が煌々と舞い、その不可思議な光景が消えた時、彼らの左手には蝶の形の奇妙な痣が･･･。
蝶は時を遡る 「タイムリープ」の力を彼らに与え、それぞれの運命を大きく変えていく。
Sky Street is a gathering place for young talents in all fields of art, sports, and music. Four teams specializing in different talents, known as "Yozora," have gathered there, creating a unique aspect of the city. One night, the large screen in the Sky Hall suddenly shines brightly. As they look up, countless butterflies flutter above their heads. And when that mysterious scene disappears, a strange butterfly-shaped birthmark appears on their left hands... The butterflies gave them the power of "time leap" - going back in time, and changed the destiny of each of them.