その群青が愛しかったようだった (Sono Gunjō ga Aishikatta Yōdatta) is a brisk 220 BPM rock track by n-buna featuring vocalist Yaginuma Kana. It originated in Sega's CHUNITHM AIR and was ported to maimai during the MURASAKi version, arriving on March 9, 2017. The song showcases n-buna's signature driving guitar work and rapid-fire vocal delivery, characteristic of the composer's style before he went on to found the acclaimed band Yorushika. Yaginuma Kana was formerly the vocalist of the band カラスは真っ白 (Karasu wa Masshiro), and also appears on the maimai track fake!fake!. The jacket illustration features Nanami Aoi (七海 あおい), a CHUNITHM character, tying the song visually to its origin game. Within maimai, the song underwent notable level rebalancing across versions: the Expert chart started at level 9 and was gradually raised to level 11, while the Master chart rose from level 11 through 11+ and 12 before settling at 12+. The Expert chart was designed by Techno Kitchen and the Master chart by ロシェ@ペンギン. A banquet (宴) chart with the punning designer credit "そのTAPは青かったようだった" was added on August 24, 2017, but is no longer selectable. The song was removed entirely from maimai's playable catalog on July 11, 2019, making it unavailable in current arcade rotations.