猛進ソリストライフ！ (Mo-shin Soliste Life!) is a character solo song performed by Nachi Tsukisuzu (CV: Ayaka Imamura), a member of the fictional band Irodorimidori (イロドリミドリ). The track was composed, arranged, and written by Kouta Aoyagi (Hifumi,inc.), with guitar performed by Kayuki and an animated music video created by 鑓田 (alpha complex). The song premiered in CHUNITHM AIR in October 2016 before arriving in maimai MURASAKi PLUS on October 31, 2017, where it is categorized under the オンゲキ＆CHUNITHM genre. Lyrically, the song paints a portrait of an artist striking out alone, rejecting conformity and empty platitudes, embracing the solitary path of the soloist who dances to their own rhythm. The title itself fuses the kanji 猛進 (mōshin, "headlong rush" or "charging forward") with the French-derived *soliste life*, reinforcing the theme of a performer who needs no ensemble. The composition's brisk 189 BPM and driving rock arrangement mirror the defiant, forward-charging energy of the lyrics. The MASTER chart (level 13+ / constant 13.7) was designed by ロシェ@ペンギン (Rocher@penguin), while the EXPERT chart (12+ / constant 12.6) was handled by 小鳥遊さん (Takanashi-san). Like the song 7thSense, the chart opens in an unusual 7/4 time signature, a rarity in maimai at the time, since every song in the FiNALE era and earlier started in standard 4/4. The BASIC difficulty sits at level 7, which is on the higher end for Irodorimidori songs at the easiest tier. Over the course of maimai DX updates, the song's chart levels have been revised multiple times, the Master difficulty alone has risen from level 12 to its current 13+ across six major version bumps, reflecting community skill inflation and re-evaluation of chart density.