Chaos Zero Nightmare hasn’t launched yet, but its theme song already has fans buzzing. Hololive English stars Calliope Mori and Nerissa Ravencroft are behind “Over//Ride,” the game’s official anthem — and it’s already turning heads across YouTube and streaming platforms.
It’s a big swing for Smilegate and Cover to have two of their most popular VTubers headline the promotional campaign. Judging by early reactions, it’s working.
“Over//Ride” Brings Star Power and Style
The track is loud, fast, and theatrical — which fits the tone of the upcoming sci-fi RPG. Calliope Mori and Nerissa Ravencroft’s performance leans heavily into the drama, and fans are loving it.
This isn’t their first time working together. The two Hololive talents previously teamed up for a cover of Bocca della Verità during the 3D concert event Requiem for Love. But this time, it’s original — and it hits differently.
“Over//Ride” dropped with a full animated music video, already racking up views. The visuals match the energy of the track, with fast cuts, intense lighting, and glitchy VFX that echo the game’s cyber-apocalypse theme.
Theme Songs Aren’t New for Calli — But This Feels Bigger
Calliope Mori has done this kind of thing before. Just last year, she handled the opening theme for Suicide Squad Isekai, one of the bolder anime/game crossover projects of 2024.
But “Over//Ride” feels like a shift. For starters, it’s a collaboration — a duet with another big name in the VTuber world. The tone is also grittier, less polished, more urgent. It sounds like a battle cry rather than a brand pitch.
And maybe that’s the point. Chaos Zero Nightmare is shaping up to be a high-stakes, high-energy experience. Having a song that screams that from the rooftops? Smart move.
Pre-Registration Milestones and Rewards Stack Up
So far, players can’t actually play Chaos Zero Nightmare yet. But they can sign up for it. And the pre-registration campaign is pulling in some serious numbers.
Smilegate confirmed that by July 13, 2025, the game had crossed the 200,000 sign-up mark. That unlocked a milestone reward of 10 Advanced Battle Memories for all future players. But that’s just the first tier.
Here’s what’s coming next if pre-reg continues to climb:
At 2 million sign-ups, all users get Amir, a four-star character, plus 20 Rescue Anchor items for the gacha system.
That’s a pretty generous giveaway, and it’s clearly designed to push hype well before the October launch. And yes — the App Store currently lists October 15, 2025 as the target date.
Short sentence to break things up.
What We Know About the Game So Far
Details on gameplay are still light, but Chaos Zero Nightmare is being pitched as a tactical RPG with cyberpunk and horror themes. Think Arknights meets Punishing: Gray Raven, but with Smilegate’s signature flair.
Previews suggest it will use a mix of grid-based movement, party formations, and combo-based attacks. The gacha system will center on rescuing characters from collapsing timelines, which — honestly — sounds about right for 2025.
Also, the game is launching on Android, iOS, and PC via Stove, Smilegate’s digital platform. A cross-play feature hasn’t been officially confirmed yet, but there’s hope.
Here’s a quick snapshot of what’s confirmed so far:
| Feature | Status |
|---|---|
| Release Date | Expected October 15, 2025 |
| Platforms | Android, iOS, PC (Stove) |
| Theme Song | “Over//Ride” by Calliope Mori & Nerissa Ravencroft |
| Pre-Register Bonus | Advanced Battle Memories, Amir, Rescue Anchors |
| Music Video | Available on YouTube & Spotify |
Hololive Hype: Why This Collab Matters
It’s not every day that VTubers headline a major mobile game release. But Hololive isn’t just any agency. With Calli and Nerissa involved, Chaos Zero Nightmare has instant visibility in Western and Japanese markets.
Their combined fanbases are massive. And more than that, they’re engaged — meaning this isn’t just about passive streams. Fans are already clipping, remixing, and posting fan art inspired by “Over//Ride.”
There’s a deeper trend here too. Game devs are starting to treat VTubers the way they treat idol singers or traditional influencers. It’s part marketing, sure, but also a kind of world-building.
Eyes on October — and Ears on That Soundtrack
The real game is still months away, but if “Over//Ride” is any clue, Chaos Zero Nightmare is going to come in swinging. The fact that the devs frontloaded their campaign with a song this big says a lot.
The buzz is growing. Pre-registration rewards are working. And fans are already learning the lyrics.
It’s not often that a song gets people to care about a mobile game before they even know what it plays like. But this one might have pulled it off.
