Nientum - Op.ZERO

Adventure· Story Rich· Atmospheric· Rhythm

Early access since Nov 2025

A 2D action-adventure where the story unfolds by tuning the stage with music. A play by Aleph and Liora, who have lost their memories. A beautiful yet eerie stage, and the secret of the forgotten theater await. Your choices will determine the play's ending — and their fates.

98% positive · 220 reviews

Not yet

In early access, content still planned

High confidence

Content Planned

Not yet

In early access, content still planned

High confidence

Content Planned

Where to buy

Steam Updated 12 Oct 2026 $19.99

Can't confirm — worth a look

We couldn't confirm these stores carry this game.

Green Man Gaming Steam key Search IndieGala Steam key Search

Prices in USD, as listed by each store.

Buying through an affiliate store helps support the site

Evaluation

Nientum - Op.ZERO launched into Early Access on November 24, 2025. The developer, QueseraGames, has communicated actively throughout the Early Access period, shipping a substantial feature update on December 23, 2025 that added Steam Cloud saves, automatic audio noise correction, full mouse support, and an overhauled input system. On August 20, 2026, QueseraGames officially confirmed the game will exit Early Access and launch in full on October 14, 2026. A series of "Release Update Preview" posts published August 27–30, 2026 detailed specific new features arriving with the full release: Hard difficulty for Story Mode, a Vending Machine in the lobby, a Collection system in the Director's Room, and story convenience tools (Backlog, Auto Play, and Scene Skip). Most recently, on October 2, 2026 — just four days before today's assessment date — the developer published a full list of 30 music tracks coming to Free Play mode with the 1.0 launch, featuring contributions from artists including Sakuzyo, Team Grimoire, and Nanahira. The post concludes with "October 14, 2026 — Full Release," reaffirming the imminent launch date. The game remains in Steam Early Access as of today, with the 1.0 release just 8 days away.

Evidence

Developer revealed 30 new music tracks coming to Free Play mode with the full release on October 14, 2026, reaffirming the launch date.

news post · Oct 2, 2026 source content planned

high

Developer officially confirmed the full 1.0 release date as October 14, 2026, with an accompanying release date trailer.

news post · Aug 20, 2026 source content planned

high

Media

Details

Developer

QueseraGames

Publisher

QueseraGames

Achievements

—

Platform

Windows

Controller

—

Steam Deck

Playable

Players

Single-player

Story Rich Atmospheric Rhythm Dark Fantasy Action-Adventure Music Surreal Anime Difficult Fantasy Hand-drawn 2D Platformer Emotional Visual Novel

About this game

"—To fade away... was it hope for you and me, or despair?"

『Nientum – Op.Zero』 is a 2D action-adventure music game that combines platformer, action, and adventure elements.

Tune the stage through musical interactions and experience a unique journey to breathe life back into a theater that has settled in a gray stillness.

A Strange Play Created Without Memories

A theater once filled with songs and stories is now filled only with silence.

In this desolate place, Aleph and Liora, who have lost their memories, become the Director and the Actress to raise the curtain on a new play.

On a stage that is beautiful yet foreboding, warm yet sorrowful, they discover lost clues one by one.

What truth will they face in the final scene of this play?

Prepare the Stage Through Action — The Power of 'Tuning'

The gems scattered throughout the stages are fragments of broken notes.

Use Aleph’s ability to tune them, play their restored notes, and restore stage devices to complete the preparations for the performance.

As platforming, puzzles, and action naturally intertwine, the theater begins to regain its vitality.

The Performance Unfolds on the Stage You Tuned

The Wizard of Oz, Cinderella, The Legend of King Arthur...

Familiar tales are reinterpreted, and sometimes twisted, into musicals that unfold before your eyes.

With each of Liora’s successful performances, a fresh glow of life returns to the theater. And their journey continues to the next act.

Truth Brought to Light — Endings Shaped by Your Choices

Nightmares and hope, wishes and despair, new encounters and farewells.

The fragments of memory lost by Aleph and Liora are revealed one by one, following your choices.

Depending on the direction of your choices, the end of the story takes a completely different turn, drastically altering their fates.

Please, join them in their journey and help raise the curtain on this strange play.

Music and Voices that Bring the Stage to Life

The stage is filled with music composed by renowned artists such as
Kagetora., Halv, and seatrus, delivering a deeply immersive experience.

The main characters—including Aleph and Liora—are brought to life by talented voice actors such as
Chika Anzai, Yuuki Takada, and Takehito Koyasu, vividly expressing the beauty and strangeness of the theater.

Additional Content

Director's Room: A space where you can record and view the various collectibles gathered while completing the play.

Free Play Mode: A dedicated mode where you can enjoy tracks built with the rhythm-action expertise of Quesera Games, separate from the main story.