Overview
最愛人生ランナー (Saiai Jinsei Runner) is a high-energy niconico & Vocaloid track by prolific Vocaloid producer かいりきベア (Kairiki Bear), featuring Hatsune Miku on vocals. The song was created as the inaugural release of Project ONSOKU (音速, "speed of sound"), a cross-franchise collaboration between Sega's Sonic the Hedgehog and Hatsune Miku that bridges the two characters through a shared theme of blistering speed. The title translates roughly to "Beloved Life Runner," and its lyrics weave Miku's signature digital delivery with Sonic-inspired imagery, spin dashes, races, and the relentless pursuit of records.
Released on November 20, 2025, 最愛人生ランナー arrived simultaneously in maimai でらっくす CiRCLE and CHUNITHM X-VERSE, with an ONGEKI Re:Fresh port following on December 25, 2025. The music video was produced by illustrator and animator のう (Nou). The song's Master chart, designed by Luxizhel at a level constant of 13.8, sits near the top of the 13+ difficulty range, demanding precise execution across its 1054 total notes. The Expert chart, designed by サファ太 (Safata), offers a dense 736-note experience at level 11 with a notable 70 Break notes that punctuate the arrangement. The in-game title awarded for clearing the Master chart, 音速のヒーロー (Speed Sonic Hero), directly connects the song's performance challenge to its Sonic-theme origins.
Videos
Charts
DX
BASIC
4(4)
258 notesDesigner: -|Tap 216Hold 22Slide 5Touch 8Break 7
ADVANCED
7+(7.6)
402 notesDesigner: -|Tap 338Hold 26Slide 8Touch 22Break 8
EXPERT
11(11)
736 notesDesigner: サファ太|Tap 496Hold 99Slide 62Touch 9Break 70
MASTER
13+(13.8)
1054 notesDesigner: Luxizhel|Tap 735Hold 61Slide 151Touch 44Break 63
Trivia
- 最愛人生ランナー serves as the first song of Project ONSOKU (音速), a crossover collaboration between Sonic the Hedgehog and Hatsune Miku. The project name is a wordplay on Sonic's identity, 音速 (onsoku) means 'speed of sound' in Japanese.
- The song was simultaneously added to both maimai DX CiRCLE and CHUNITHM X-VERSE on November 20, 2025, and later arrived in ONGEKI Re:Fresh on December 25, 2025, making it a rare triple-rhythm-game debut.
- The music video was created by the artist のう (Nou), who handled the movie production for the song.
- Clearing the Master chart earns the in-game title 音速のヒーロー (Speed Sonic Hero). In the CiRCLE PLUS update this title was downgraded from a silver-tier badge to a white-tier badge.
- The lyrics are packed with Sonic-themed vocabulary, 'スピンダッシュ' (Spin Dash), racing terminology (RACE / RACER), and speed-related exclamations, blended into a classic Kairiki Bear Vocaloid rock arrangement at a driving 180 BPM.
- Kairiki Bear is a well-known Vocaloid and rock producer whose catalog includes viral hits such as 'Darling Dance' and 'VENOM,' though 最愛人生ランナー marks his first contribution to the Project ONSOKU initiative.
- The Master chart by Luxizhel contains 151 Slide notes, the most of any note type after Tap, giving the chart a flowing, swirling feel that mirrors the song's high-speed runner motif.
- The Expert chart (サファ太) features an unusually high Break-note count of 70 out of 736 total notes, roughly 9.5% of the chart, creating frequent scoring opportunities for players who can time them well.
FAQ
- What is Project ONSOKU in maimai?
- Project ONSOKU (音速) is a collaboration between Sonic the Hedgehog and Hatsune Miku, with 最愛人生ランナー as its first song. The name plays on the Japanese word for 'speed of sound,' directly referencing Sonic's super-speed identity. The project spans multiple Sega rhythm games including maimai DX, CHUNITHM, and ONGEKI.
- Who composed 最愛人生ランナー?
- The song was composed, arranged, and written by かいりきベア (Kairiki Bear), a well-known Vocaloid producer, with Hatsune Miku providing the vocals and のう (Nou) creating the music video.
- What difficulty is the Master chart of 最愛人生ランナー?
- The Master chart is rated 13+ with a level constant of 13.8, placing it at the higher end of the 13+ range. It contains 1054 total notes (735 Tap, 61 Hold, 151 Slide, 44 Touch, 63 Break) and was designed by Luxizhel.
- Which maimai version added 最愛人生ランナー?
- 最愛人生ランナー was added to maimai でらっくす CiRCLE on November 20, 2025. The Asian version of maimai DX CiRCLE received the song on March 27, 2026.
- What does the title 最愛人生ランナー mean?
- The title translates roughly to 'Beloved Life Runner.' It reflects the song's high-speed runner theme tied to Project ONSOKU, with lyrics that weave together Hatsune Miku's vocaloid delivery and Sonic the Hedgehog's racing and spin-dash imagery.
- Who designed the charts for 最愛人生ランナー in maimai?
- The Expert chart was designed by サファ太 (Safata), and the Master chart was designed by Luxizhel. The Basic and Advanced charts have no listed designer.
- What other rhythm games feature 最愛人生ランナー?
- Besides maimai DX CiRCLE, the song also appears in CHUNITHM X-VERSE (added November 20, 2025) and ONGEKI Re:Fresh (added December 25, 2025), making it a cross-title Sega rhythm game release.
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