Overview
KILLER B is a high-energy VOCALOID track by Japanese producer Umetora (梅とら), originally created as the character theme for Maria=S=Leonburg from Sega's competitive multiplayer game #COMPASS (#コンパス). The song stands out for its vocal lineup—five VOCALOIDs (Megurine Luka, Hatsune Miku, GUMI, IA, and Kagamine Rin) trade verses over a driving electronic-rock arrangement at 130 BPM, punctuated by the percussive "BOOM BOOM BOOM" refrain. The music video, animated by illustrator Akaane (秋赤音), complements the track's rebellious tone with vivid, color-saturated visuals.
KILLER B was added to maimai でらっくす PLUS on March 6, 2020, under the niconico & VOCALOID category, and later crossed over into CHUNITHM CRYSTAL PLUS as part of a limited-time #COMPASS collaboration event. In maimai, the song features DX charts across four difficulties. The Master chart, designed by はっぴー (Happy) at a 12+ level (12.8 constant), is notable for its dense 651-note count with only 3 Break notes—a design choice that emphasizes Tap accuracy over Break-heavy scoring. The Expert chart was designed by 小鳥遊さん (Takanashi-san). A level adjustment on Basic (from 4 down to 3) was applied starting with maimai でらっくす UNiVERSE PLUS, reflecting ongoing rebalancing across the DX era.
Videos
Charts
DX
BASIC
3(3)
128 notesDesigner: -|Tap 97Hold 8Slide 2Touch 14Break 7
ADVANCED
6(6)
226 notesDesigner: -|Tap 157Hold 36Slide 6Touch 23Break 4
EXPERT
10(10)
463 notesDesigner: 小鳥遊さん|Tap 299Hold 55Slide 40Touch 44Break 25
MASTER
12+(12.8)
651 notesDesigner: はっぴー|Tap 482Hold 29Slide 69Touch 68Break 3
Trivia
- KILLER B is the character theme of Maria=S=Leonburg from Sega's competitive multiplayer game #COMPASS (#コンパス).
- The song features five VOCALOID vocalists: Megurine Luka, Hatsune Miku, GUMI, IA, and Kagamine Rin—an unusually large ensemble for a single Umetora track.
- The music video was created by illustrator Akaane (秋赤音), known for her distinctive, vividly colored art style that has accompanied many Umetora VOCALOID songs.
- KILLER B was added to maimai でらっくす PLUS on March 6, 2020 in Japan. The Asian version followed on September 10, 2020, and the Chinese version on May 21, 2021 as part of 舞萌DX 2021.
- In CHUNITHM, KILLER B was unlockable from December 24, 2020 to January 20, 2021 via the #COMPASS #2 MAP event in CHUNITHM CRYSTAL PLUS, before becoming available by default from CHUNITHM PARADISE onward.
- The Master difficulty level was originally classified as 12+ and has remained at that tier through all maimai DX versions, while the Basic difficulty was reduced from level 4 to 3 starting with でらっくす UNiVERSE PLUS.
- In CHUNITHM, KILLER B's artist credit is listed as 梅とら「#コンパス」, explicitly tying the song to its #COMPASS origin.
FAQ
- Who composed KILLER B?
- KILLER B was composed, arranged, and written by Umetora (梅とら), a Japanese VOCALOID producer known for his high-energy electronic-rock style.
- What VOCALOIDs are featured in KILLER B?
- The song features five VOCALOID vocalists: Megurine Luka, Hatsune Miku, GUMI, IA, and Kagamine Rin.
- What is KILLER B about and where does it come from?
- The lyrics describe breaking through limitations and embracing unrestrained excitement, with a recurring 'BOOM BOOM BOOM' hook. The song serves as the character theme for Maria=S=Leonburg from Sega's game #COMPASS (#コンパス).
- Which maimai version added KILLER B?
- KILLER B was added to maimai でらっくす PLUS on March 6, 2020 in Japan. It later released in Asian regions on September 10, 2020 and in China on May 20, 2021.
- Who designed the maimai charts for KILLER B?
- The Expert chart was designed by 小鳥遊さん (Takanashi-san) and the Master chart by はっぴー (Happy).
- Does KILLER B appear in other rhythm games?
- Yes, KILLER B also appears in CHUNITHM, first debuting in CHUNITHM CRYSTAL PLUS during a limited-time #COMPASS collaboration event. It became available by default starting from CHUNITHM PARADISE.
- Who created the music video for KILLER B?
- The music video was created by illustrator Akaane (秋赤音), a well-known artist in the VOCALOID music video scene.
