Developer: PenGames
At a glance
94 Steam reviews rate it “Very Positive” (97% positive). Released on June 2, 2026 by PenGames. Current price: $9.99.
Description
★Game Overview
"ULTRA0" is an easy-to-play pseudo-3D shooter that has a lot of visual novel parts.
In N Country, facing extinction from relentless monster attacks, young girls take up arms against the approaching threats.
You play as the elite warrior Shirogane, tasked with hunting down mysterious giant monsters.
Collect supply items to power up your character and take down wave after wave of monstrous foes!
★Simple Controls!
Move your character to aim at enemies, and attacks will be automatically unleashed.
Powerful Bombs and Skills can also be activated with a single button press!
Annihilate the oncoming monsters!
★Story
It was ten years ago when a kaiju first appeared in Nation N.
Countless lives have been lost in the long and brutal struggle that followed.
Now, the last line of defense rests in the hands of the remaining girls.
Among them is Shirogane, a member of the elite Unit 81—one of the most dangerous active combat zones. With exceptional combat prowess, she has saved her comrades time and time again from the kaiju threat.
Today, once again, she steps onto the battlefield—
to face a new, unknown kaiju.

Get stronger with items!
Items can be obtained randomly along the way.
If you're lucky, the item's effect might be doubled or tripled!
The protagonist changes with each chapter.

Supported languages: english, japanese
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Description and screenshots are provided by the publisher via the Steam Store page.
System Requirements
Windows
- Requires a 64-bit processor and operating system
- OS: windows11(64bit)
- Processor: Intel Core i7 or better
- Memory: 16 GB RAM
- Storage: 1 GB available space
- Requires a 64-bit processor and operating system
Mac
Linux
User Reviews
This game is fun and has some interesting gameplay. But this is mainly a story driven game. The gameplay is sort of the same and it mainly functions to give you the story. The story is interesting and there's a few questions that you might come away with but that's fine. I think it's worth it!
i'll preface this by saying: go in blind. i did not know what i was getting into. why is nobody playing this? this is my GOTY and the best piece of entertainment i've experienced in a long time. couldn't put it down.
it's a well done rail shooter, albeit fairly easy - which works as the story is often being told during gameplay, nuances you don't want to miss. it's simple: autolock and autofire, then focus on dodging. not difficult (you also upgrade from gems you collect which helps you breeze thru it), but still satisfying and engaging. i'd still recommend if it was just the shmup part... what i did -not- expect was how good of a VN this is. it's probably 40/60 shooter/VN and it hits on every note, pitch perfect. the art, wit, humor, horror, all blended into something genuinely special and very much its own. this game does not overstay its welcome either, with great pacing and no filler.
i felt old emotions coming back to me, from my youth when anime like Elfen Lied were new. didn't foresee how emotionally invested i'd be, especially on the level of the aformentioned era of anime. i have trouble finishing most things these days but ULTRA0 hooked me. if you want to laugh, cry, FEEL things like happiness, sadness, and hope then i can't recommend this one enough. more than worth the price, sale or not.
nothing but the highest praise here, truly something fresh. i pray more people buy this because it's sitting at 91 reviews which is a datgum shame.
started & finished this in 1 day & it might be one of my favorite games now. while the gameplay itself is nothing groundbreaking, it's still really fun & easy to get into, even for casuals. the story is the real star here, it's well-written & i found it impactful enough to tell all my friends about it & leave review, which isn't something i really do. u can beat it in a few hours & the price is well-worth it. i highly highly recommend this one if ur a fan of yuri-tinged stories where everyone is suffering in some capacity
I didn't quite grasp the plot 100%, but it was still really good. 7/10
Anime as ♥♥♥♥/10. Loved the visuals and soundtrack. The story being foremost over a more arcadey experience was a nice surpise that I definitely appreciated. The story went in a direction I didn't expect, which made for an interesting second half. I wish that some things about the ending were better explained, and I wish that a certain couple had a happier outcome, but all in all it was a fun experience that I would recommend.
Additional Information
| Developer | PenGames |
| Platforms | Windows |
| Age rating | None |
| Release date | June 2, 2026 |
| User reviews | 97% positive (94) |