Overview
"Amereistr" (アメレイストル) is an original instrumental composition by rN, marking the artist's debut original track for the maimai rhythm game series. It was added to maimai でらっくす PRiSM PLUS on July 11, 2025, as the Perfect Challenge unlock song for 7sRef Area 4, a story chapter in which characters Riz and Acid confront a spreading black bug corruption. The track's title is a constructed word read as "Amereistr"; rearranging its letters yields "re(i)master," a nod to maimai's highest chart difficulty tier. Musically, Amereistr is notable for its intricate rhythmic construction: it employs metric modulation, frequent time signature changes, and layered polyrhythms, culminating in a final section that cycles through a 2:3:4:5:6 polyrhythm followed by a 2:3:4:5:7 polyrhythm, an unusually dense rhythmic passage for a maimai song. The track is a spiritual successor to "Anteisce," a piece rN originally wrote for the Corsace Open 2022 tournament in osu!. The game's jacket art was handled by 八重幸 with illustrations by あるてら and 鳴瀬うろこ.
Videos
Charts
DX
BASIC
5(5)
261 notesDesigner: -|Tap 231Hold 13Slide 4Touch 8Break 5
ADVANCED
8(8)
436 notesDesigner: -|Tap 366Hold 18Slide 10Touch 34Break 8
EXPERT
12(12.5)
263 notesDesigner: サファ太|Tap 122Hold 53Slide 12Touch 31Break 45
MASTER
13+(13.9)
738 notesDesigner: Jack|Tap 466Hold 102Slide 31Touch 67Break 72
Trivia
- Amereistr is rN's first original song composed specifically for a rhythm game; the artist previously contributed to the osu! community with tracks like 'Anteisce' for the Corsace Open 2022 tournament.
- The title 'Amereistr' is read as アメレイストル. Its letters can be rearranged to spell 're(i)master,' a deliberate reference to the Re:Master difficulty tier in maimai DX.
- The song makes heavy use of metric modulation, polyrhythms, and time signature changes, elements rarely featured in maimai's song library at this density.
- The MASTER chart's ending section (ラス殺し) features a 2:3:4:5:6 polyrhythm in the first cycle and a 2:3:4:5:7 polyrhythm in the second, as confirmed by rN on X (Twitter).
- rN published a detailed article on note.com explaining the song's complex rhythmic construction, including the layered polyrhythmic structures used throughout.
- In a Q&A livestream, rN stated that the track's complex rhythms were written for fun, and that he felt maimai players had been 'getting lousy with rhythms' since the introduction of EX notes, motivating him to challenge the playerbase.
- The song is connected to the 7sRef narrative arc: the flavor text describes a black bug corruption spreading through 7sRef, causing doors to lock and gatekeepers to shut down, with Riz and Acid at the center of the crisis.
- Amereistr was initially unlockable via a Perfect Challenge in 7sRef Area 4 after reaching a cumulative 1500 km distance. It later received general unlock availability on March 19, 2026 in Japan, and November 14, 2025 in the Asian version.
- The MASTER chart was designed by Jack, and the EXPERT chart by サファ太 (Safata), both known for their work on maimai DX original charts.
FAQ
- Who composed Amereistr?
- Amereistr was composed, arranged, and produced by rN, marking the artist's first original song for a rhythm game.
- What does the title Amereistr mean?
- Amereistr (read as アメレイストル) is a constructed word with no established meaning. Its letters can be rearranged to spell 're(i)master,' a pun on maimai's Re:Master chart difficulty.
- When was Amereistr added to maimai?
- Amereistr was added to maimai でらっくす PRiSM PLUS on July 11, 2025. It was initially available as a Perfect Challenge unlock in 7sRef Area 4, and later received general availability on March 19, 2026 in Japan and November 14, 2025 in the Asian version.
- Is Amereistr rhythmically complex?
- Yes. Amereistr heavily employs metric modulation, polyrhythms, and time signature changes. The ending section cycles through a 2:3:4:5:6 polyrhythm followed by a 2:3:4:5:7 polyrhythm, making it one of the most rhythmically dense tracks in maimai.
- Who designed the MASTER chart for Amereistr?
- The MASTER chart was designed by Jack, and the EXPERT chart was designed by サファ太 (Safata).
- Does Amereistr have lyrics?
- No. Amereistr is an instrumental track with no vocals or lyrics.
- What is Amereistr related to in osu!?
- Amereistr is a spiritual sequel to 'Anteisce,' a song rN composed for the Corsace Open 2022 tournament in osu!. Both tracks share a similar rhythmic intricacy and compositional style.
External Links
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