SEGA surprised his fans with the announcement of Project onsokua new initiative that combines two of its most iconic franchises and characters: Hatsune Mikuthe virtual star of vocaloid music, and Sonic The Hedgehogthe fast blue lipstick that has been the company's face for more than three decades. The project is not limited only to music. It will also have an impact on the next racing video game Sonic Racing: Crossworldswhich will arrive this year.
Weekly songs as part of Project onsoku
The proposal focuses on a series of original songs created especially for collaboration. The first theme to go to light was “Sai Love Jinsei Runner”composed of Kairiki Bearone of the most influential producers within the vocaloid scene. In addition to the musical composition, the artist was also responsible for making the official cover of the single. To complement the launch, the illustration that shows together to Miku and Sonic was the work of the illustrator Nou. Its vibrant and colorful style reflects the energy of both characters.
Sega revealed that Project onsoku will not be an isolated event. It will develop for several weeks, with Weekly premieres of new songs Until the end of September 2025. With Project onsoku, each musical piece will have its own style and a different producer. This guarantees variety and attractive both for vocaloid music fans and Sonic followers.
The calendar confirmed by the company is as follows:
- September 1, 2025 – We Are Picopico Hammers !!!! by Cosmo@bousou-p
- September 8, 2025 – Jet Black by Yunosuke
- September 15, 2025 – Treasure Garden by Ponchi
- September 22, 2025 – Denkou Sekka by Camellia

This approach for weekly deliveries seeks to maintain the interest of the community. It aims to generate expectation and, at the same time, offer a showcase for several recognized producers of the vocaloid scene.
The link between Sega and Hatsune Miku
The relationship between Sega and Hatsune Miku It is not new. For more than a decade, the company has collaborated with Crypton Future Mediacreator of the virtual singer, in multiple rhythmic video games that became cult phenomena. The series Project diva And the most recent Project Sekai: Colorful Stage They are examples. These titles helped consolidate the image of Miku as a cultural icon inside and outside Japan.
For its part, Sonic is the official Mascot of SEGA since 1991. Its trajectory covers platforms, comics, movies and even animated series. The union of both characters represents a mixture between the Nostalgia of the 90s classics and the Contemporary popularity of the vocaloid phenomenon.
In addition to music, SEGA confirmed that All Project Unsoku songs will be included in the soundtrack of Sonic Racing: Crossworldsits new racing title. This game will bring together several characters from the Sonic Universe and now also special guests.
Project onsoku also reaches video games
During the Summer Game Fest 2025held in June, Sega had already advanced that Hatsune Miku would be one of the playable invited characters in the title. With this announcement, it is clear that Project Unsaku has made its participation broader. Miku will not only be available as a pilot, but will also contribute a significant part of the sound experience of the game.
Sonic Racing: Crossworlds The September 25, 2025. The title will reach PS5, PS4, Xbox Series X | S, Xbox One, Nintendo Switch and PCwith an additional edition confirmed for the next Switch 2.
The combination of new songs, classic characters and the active participation of figures such as Hatsune Miku acts as Project onsoku one of Sega's most ambitious and striking projects in recent years. For the company, it represents the opportunity to keep Sonic in force. It also seeks to expand Miku's international presence. In addition, it reinforces its identity as a company that bets on cultural innovation and the union between video games and music.

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