Project SEKAI is a smartphone rhythm game that’s especially popular among Gen Z, from teens to people in their twenties.
The game is a hot topic because you can enjoy top-quality hit songs by Vocaloid producers, brought to life through performances by original units and virtual singers like Hatsune Miku.
The synergy between the game’s worldbuilding and the diverse, dazzling tracks by Vocaloid producers and uniquely styled units offers wonderful encounters—not just for fans, but also for those who don’t usually listen to Vocaloid music.
This article introduces some of Project SEKAI’s most popular songs.
Be sure to check out tracks beyond your usual favorites, too!
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[Vocaloid Rhythm Game] Project Sekai’s Best Popular Songs: Masterpieces Showcasing Unique Styles and Strengths (1–10)
lowerslime; slipperiness; sliminess


It’s a high-sense four-on-the-floor tune that draws you in with jazzy piano tones.
Created by the Vocaloid producer Nuyuri—known for hits like “Inochi Bakkari” and “Fragile”—it was released in 2021.
You can’t help but ponder the story between “me” and “you”; it’s the kind of song that makes you want to dive into theories or even map it out in a relationship chart.
A track with this mysterious vibe fitting into Nigo’s catalog… it just feels incredibly right.
Tondemo Wonderssasakure.UK


Lively, pop-driven tones race on through! This track by sasakure.
UK, a Vocaloid producer known for progressive musicality, was written specifically for the in-game unit Wonderlands x Showtime.
Its bright sound and rapid-fire melody pair perfectly with lyrics that look toward a future with friends! Just one listen will boost your spirits in an instant.
A self-remix version has also been released, so be sure to check it out if you’re interested!
bugKairiki Bear


A highly addictive mixture rock sound that keeps surging in! It’s a track by Vocaloid producer Kairiki Bear, released in 2022, written specifically for the unit 25-ji, Nightcord de.
The bouncing melody line makes you want to sing along before you know it.
In fact, I bet many people choose it often at karaoke.
The bold, flashy tones all the way down to the low end are quintessential Kairiki Bear! The lyrics are packed with words that feel great on the tongue, which is another draw.
It makes you want to crank up the volume!
turning into a potatoNeru


It’s a piece with a horn section timbre that lingers in your ears, reminiscent of a musical number.
The song is by the Vocaloid producer Neru, known for numerous hits like “Lost One’s Weeping,” and it was released in 2020.
It was provided for the unit Wonderlands×Showtime.
One of its charms is the gap between the glamorous, catchy sound and lyrics themed around “sloppiness.” It makes you want to sway your shoulders leisurely as you listen.
Danceable tracks really shine in Project Sekai!
cinemaAyase


It’s a chic, mature dance number.
“Cinema,” by Ayase—also known as the composer for YOASOBI—was released in 2021.
It’s an original song written for the unit Vivid BAD SQUAD.
The lyrics compare a life that isn’t going well to a movie, which should especially resonate with younger listeners.
The way the track moves along rhythmically feels like ideas bubbling up one after another.
The Hatsune Miku version has a more chiptune-like finish than the Vivid BAD SQUAD version.
Comparing different versions of songs in Proseka is part of the fun, isn’t it!
IdentityKanaria


This is “Identity,” a track by Vocaloid producer Kanaria—who also drew attention for creating an ending theme for the anime Chainsaw Man—released in 2022.
It features Kanaria’s signature sound: a shadowy arrangement layered with sharp, punchy vocals that sounds incredibly cool.
It pairs perfectly with the whispery voice of 25-ji, Nightcord de.
’s member, Kanade Yoisaki.
It’s also a great recommendation for anyone looking for a duet song to sing at karaoke!
Idolish7: IDOLiSH7 - iDOLiSMILEToa


One of the songs by 25-ji, Nightcord de.
, created by Toa—also known for works like “Puzzle Girl” and “Tugihagi Staccato”—and released in 2021.
The five-person choral work is utterly mesmerizing, isn’t it? The dreamy, delicate vocals pair beautifully with the profound lyrics themed around human connection.
The gentle sound arrangement that delivers that message really sinks in as well.
.
.
The more you listen, the more it grows on you—truly a masterpiece!