勝手に生きましょ (Katte ni ikimasho) is an original song performed by Ui Shigure (しぐれうい), a Japanese illustrator and VTuber affiliated with Hololive Production. The track was composed, arranged, and written by Iyowa (いよわ), a prolific Vocaloid and doujin-circle producer whose earlier rhythm-game contributions include きゅうくらりん (Kyūkurarin) and ももいろの鍵 (Momoiro no Kagi), both of which also appear in the maimai series. It was released on Shigure's 2024 album fiction and later added to maimai でらっくす CiRCLE on January 9, 2026 as a POPS & ANIME category song. The song's structure is notable for alternating between two perspectives: verses portraying Ui Shigure as an illustrator and verses portraying her as a VTuber, a lyrical duality that reflects her dual creative identity. The music video, also produced by Iyowa, accompanies the track with visuals that complement this theme. In maimai, the song's charts span four DX difficulties, Basic (3), Advanced (7), Expert (10), and Master (13), with the Expert chart designed by サファ太 (Safata) and the Master chart by Jack, both of whom are recurring notes designers in the maimai DX era.