Real name: Hatsune Miku.

Chronologically 16 years old. Height: 158cm, Weight: 42kg. Her anniversary is August 31st (8/31, as 3 and 9 can be read as "Mi-ku"). March 9th is also frequently treated as a Miku anniversary for the same reason.

She has slightly pale blue (some might see it as green or light blue) hair tied in twin-tails.

A "Sekai" is typically born from people's feelings, and VOCALOIDs reflecting those feelings usually reside there. However, the Sekai where this Miku was born arose from the dark emotions of countless people, manifesting because those people wished to be "saved."

Consequently, this Miku tries to deliver songs to save the owners of those feelings. However, the Sekai she was born into is broken, and because of that, she cannot sing like the world-famous "Electronic Diva Hatsune Miku," and her feelings remain undelivered.

This broken world is overall dark with window-like objects floating everywhere. The ground is made of sand-like material, and the sky is pitch black as if the entire world is covered by something.

Above the Sekai hangs a mass of tangled trees leaking a black miasma. When human emotions reach their limit, this structure breaks, and a sinister, reddish-black blood-like substance floods the world.

In a normal Sekai, other VOCALOIDs should be present, but for some reason, Miku is all alone here.

This Sekai acts as a reservoir for dark human emotions, and negative whispers can occasionally be heard.

First person: I (polite, feminine).

She works hard to deliver songs to clear away the dark emotions of the owners, but to those people who have no emotional leeway, Miku's form and voice sound like nothing but noise, and she is rejected.

Despite this, she continues to try her best, but no one knows when her heart will reach its breaking point.

Miku is kind-hearted and lives for the sake of others. She is a bit shy and seems to lack self-confidence.

She has somewhat short twin-tails adorned with several large X-shaped hair ornaments. Her outfit is scattered with X marks. While it retains elements of the classic Hatsune Miku design, it is entirely black. The clothes are slightly oversized, as if she is withdrawing into her own shell.

Because the Sekai is a collective manifestation of many people's thoughts, one can enter it if they wish. However, it seems no one has the mental capacity to do so, nor do they even know of the Sekai's existence.

She does not hesitate to sacrifice herself if it means saving someone else.