Overview
㋰責任集合体 (Musekinin Shūgōtai, "Irresponsible Aggregate") is an original song by composer, lyricist, arranger, and video creator マサラダ (Masarada), featuring the UTAU/Synthesizer V voicebank Teto Kasane (重音テト). The track first appeared on Masarada's self-titled 2024 album before arriving in maimai DX PRiSM PLUS on June 27th, 2025 as part of the niconico & VOCALOID genre. Its title uses the circled katakana ㋰ as a playful substitute for the character 無 (mu, "nothing"), reading as 無責任集合体, an ironic label for a song whose lyrics chant "I don't know, I don't see anything" and revel in willful irresponsibility. The official music video, also produced by Masarada, features Teto Kasane SV with a chaotic, meme-inflected visual style that matches the track's self-deprecating energy. Beyond maimai, the song appears in SEGA's CHUNITHM X-VERSE-X, making it one of the newer niconico-genre crossovers across the two arcade rhythm game lines.
The maimai chart roster spans Basic (level 3) to Master (level 13, constant 13.4). The Expert chart, designed by サファ太 (Safata), is notable for containing zero Touch notes at level 9+, an unusual omission that shifts its challenge entirely to Tap, Hold, Slide, and Break patterns. The Master chart, designed by はっぴー (Happy), spreads 979 notes across all five note types, with 57 Touch placements and 86 Break notes demanding precise panel coverage.
Videos
Charts
DX
BASIC
3(3)
226 notesDesigner: -|Tap 186Hold 8Slide 4Touch 15Break 13
ADVANCED
7(7)
380 notesDesigner: -|Tap 338Hold 14Slide 7Touch 11Break 10
EXPERT
9+(9.6)
544 notesDesigner: サファ太|Tap 389Hold 78Slide 28Touch 0Break 49
MASTER
13(13.4)
979 notesDesigner: はっぴー|Tap 664Hold 59Slide 113Touch 57Break 86
Trivia
- The song was produced entirely by マサラダ (Masarada), who handled composition, arrangement, lyrics, and the music video, with vocals provided by the UTAU/Synthesizer V voicebank Teto Kasane (重音テト).
- The circled katakana ㋰ in the title is a stylized stand-in for 無 (mu, 'nothing'), turning the phrase into 無責任集合体 ('Irresponsible Aggregate'), a direct match for the song's lyrical theme of feigned ignorance and abdicated responsibility.
- ㋰責任集合体 was first released as a digital album track in 2024, roughly a year before its maimai debut.
- The song also appears in CHUNITHM X-VERSE-X, where it was added on December 18th, 2025 (with the Asian version receiving it at that cabinet's launch).
- The Expert chart (level 9+) by サファ太 contains zero Touch notes, a relatively sparse configuration for the DX format at that difficulty level, making it play more like a traditional maimai STANDARD-style chart.
- The Master chart by はっぴー (Happy) carries a level constant of 13.4, placing it at the higher end of the 13 tier in PRiSM PLUS.
- In the Asian version of maimai DX PRiSM PLUS, the song was added on November 21st, 2025, roughly five months after the Japanese release.
- The official YouTube upload uses the title '㋰責任集合体／重音テトSV', indicating the track uses Teto Kasane's Synthesizer V (SV) voicebank rather than the original UTAU version.
FAQ
- Who composed ㋰責任集合体?
- The song was composed, arranged, and written by マサラダ (Masarada), who also created the music video.
- Who sings ㋰責任集合体?
- The vocals are performed by Teto Kasane (重音テト), a well-known UTAU and Synthesizer V voicebank.
- What does ㋰責任集合体 mean?
- The title is a play on 無責任集合体 (Musekinin Shūgōtai), meaning 'Irresponsible Aggregate.' The circled katakana ㋰ substitutes for 無 (mu), matching the song's theme of defiant irresponsibility.
- When was ㋰責任集合体 added to maimai?
- It was added to maimai DX PRiSM PLUS on June 27th, 2025. The Asian version followed on November 21st, 2025.
- What difficulty levels does ㋰責任集合体 have in maimai?
- The song has four DX charts: Basic at level 3, Advanced at level 7, Expert at level 9+ (constant 9.6), and Master at level 13 (constant 13.4).
- Who designed the ㋰責任集合体 Master chart?
- The Master chart was designed by はっぴー (Happy). The Expert chart was designed by サファ太 (Safata).
- Does ㋰責任集合体 appear in other rhythm games?
- Yes, the song also appears in CHUNITHM X-VERSE-X, added on December 18th, 2025 (with the Asian version receiving it at launch).
- What is unique about the Expert chart for ㋰責任集合体?
- The Expert chart (level 9+) contains zero Touch notes, an uncommon design choice for a DX chart at that difficulty tier, placing all its challenge on Tap, Hold, Slide, and Break patterns.
