Ultranova is an instrumental trance track by A4paper, added to maimai during the MURASAKi PLUS update as the third Challenge Track. It forms the third entry in the composer's "nova" series, following the BMS (Be-Music Source) works Supernova and Hypernova, all three sharing a BPM of 156 and the ENERGETIC TRANCE classification. The song's driving beat, rapid synth arpeggios, and absence of vocals place it firmly in the instrumental trance tradition common to the BMS scene where A4paper built their reputation. The Master chart, designed by 小鳥遊さん (Takanashi-san), is defined by dense five-note jack patterns that appear prominently in the chorus sections, demanding precise and rapid finger coordination. A notable pattern quirk appears in the latter half of the chart, where hold notes transition into slide notes mid-phrase, catching players off guard. The Expert chart, designed by Jack, offers a demanding experience at level 12.9, the upper edge of the 12+ range. Ultranova originally debuted as a limited-time Challenge Track from September 7 to September 20, 2017, before becoming permanently unlockable. Across subsequent maimai versions, its chart levels were adjusted multiple times as the series' overall difficulty standards evolved, with the Master chart eventually settling at level 14. The jacket art and in-game movie were created by Photonskyto.