Overview
群青讃歌 (Gunjou Sanka; "Ultramarine Hymn") is a collaborative anniversary song by Eve, created for the first anniversary of Project Sekai: Colorful Stage! feat. Hatsune Miku. Unusually for a Project Sekai original song, it brings together Hatsune Miku with all five unit leaders, Ichika Hoshino (Leo/need), Minori Hanasato (MORE MORE JUMP!), Kohane Azusawa (Vivid BAD SQUAD), Tsukasa Tenma (Wonderlands×Showtime), and Kanade Yoisaki (25-ji, Nightcord de.), each performed by their respective voice actors, for a one-time ensemble performance. Eve wrote the lyrics and composition, with arrangement by Numa, producing an uplifting pop-rock track at 168 BPM centered on themes of letting go of regret and moving forward despite uncertainty.
The song arrived in maimai DX FESTiVAL on October 7, 2022, classified under the niconico & VOCALOID genre. Its MASTER chart, designed by はっぴー at level 12.4, makes distinctive use of Slide notes, 65 out of 385 total, to trace the song's soaring melodic lines across the screen. The EXPERT chart by 翠楼屋 offers a solid level 9 challenge. Beyond maimai, 群青讃歌 also crossed over into CHUNITHM SUN in February 2023, making it one of the few Project Sekai anniversary songs to appear across Sega's arcade rhythm game lineup.
Videos
Charts
DX
BASIC
1(1)
71 notesDesigner: -|Tap 58Hold 6Slide 2Touch 4Break 1
ADVANCED
6(6)
210 notesDesigner: -|Tap 172Hold 17Slide 6Touch 13Break 2
EXPERT
9(9)
335 notesDesigner: 翠楼屋|Tap 272Hold 29Slide 17Touch 7Break 10
MASTER
12(12.4)
385 notesDesigner: はっぴー|Tap 256Hold 26Slide 65Touch 21Break 17
Trivia
- 群青讃歌 was originally released within Project Sekai: Colorful Stage! feat. Hatsune Miku in September 2021 as the game's first anniversary commemorative song, over a year before its maimai debut.
- The song is unique within Project Sekai for bringing together Hatsune Miku with the representative leader character from each of the game's five units in a single track, rather than featuring a single unit as most original songs do.
- The voice cast includes Ruriko Noguchi (Ichika Hoshino), Yui Ogura (Minori Hanasato), Akina (Kohane Azusawa), Daisuke Hirose (Tsukasa Tenma), and Tomori Kusunoki (Kanade Yoisaki).
- Composition and lyrics were handled by Eve, a prolific Japanese singer-songwriter and Vocaloid producer known for hits such as Kaikai Kitan (the opening theme of Jujutsu Kaisen) and Yoru ni Kakeru, with arrangement by longtime collaborator Numa.
- The MASTER chart by はっぴー contains 65 Slide notes out of 385 total, roughly 17% of the chart, giving it a notably flowing, sweeping feel that matches the song's uplifting melody.
- In the Asian version, the song was added to maimai DX FESTiVAL PLUS on October 6, 2023, and in the Chinese version it arrived on 舞萌DX 2025 on December 4, 2025.
- The song also appears in CHUNITHM SUN, added on February 9, 2023 in Japan, with Asian and Chinese releases following later that year and in 2025 respectively.
FAQ
- Who composed 群青讃歌 (Gunjou Sanka) for maimai?
- 群青讃歌 was composed and written by Eve, a well-known Japanese singer-songwriter and Vocaloid producer. The arrangement was handled by Numa.
- What is 群青讃歌 about?
- The lyrics reflect on leaving the past behind, embracing imperfections, and moving forward into the future while balancing expectation and anxiety, fitting themes for a milestone anniversary song written for Project Sekai's first anniversary.
- What Project Sekai characters appear in 群青讃歌?
- The song features Hatsune Miku alongside the five unit leaders from Project Sekai: Ichika Hoshino (Leo/need), Minori Hanasato (MORE MORE JUMP!), Kohane Azusawa (Vivid BAD SQUAD), Tsukasa Tenma (Wonderlands×Showtime), and Kanade Yoisaki (25-ji, Nightcord de.), each voiced by their respective voice actors.
- When was 群青讃歌 added to maimai?
- The song was added to maimai DX FESTiVAL on October 7, 2022 in Japan. It later arrived in the Asian version (FESTiVAL PLUS) on October 6, 2023, and the Chinese version (舞萌DX 2025) on December 4, 2025.
- What difficulty is the MASTER chart for 群青讃歌 in maimai?
- The MASTER chart is level 12 with a difficulty constant of 12.4, designed by はっぴー (Happy). It contains 385 total notes with a notable emphasis on Slide notes (65), giving the chart a flowing character that mirrors the song's melody.
- Does 群青讃歌 appear in other rhythm games besides maimai?
- Yes, the song also appears in CHUNITHM SUN, another Sega arcade rhythm game, where it was added on February 9, 2023 in Japan, with Asian and Chinese releases following later.
- Who designed the maimai charts for 群青讃歌?
- The EXPERT chart was designed by 翠楼屋 (Suirouya), and the MASTER chart was designed by はっぴー (Happy). The Basic and Advanced charts do not have credited designers.
