「World is Mine – Hatsune Miku」Wiki
Composed by ryo(supercell). "World is Mine" is an original VOCALOID song by ryo (of Supercell), sung by Hatsune Miku. The song is about a spoiled girl who believes herself to be a "princess" that the world revolves around, and details her struggles with falling in love with a standoffish boy. There are many PV variations for this song; however, the narrator is almost always portrayed as a "tsundere" but short-tempered and fickle Miku (interesting because of the meek and sweet-tempered manner Miku is often portrayed having).
(Cited from "Vocaloid Wikia")