Dance HIME: Rhythm And Extinction is set in a SINGULARITY world created by four magic instruments. As a "tuner", you are summoned by resonating with the sacred echo of the artifact, and the elves use the artifact infinite drum to successfully summon you to Siguroldi. In fact, the world of Sigordi at this time is in a state of rest, and the area you are in is the "singularity field" created by the instrument of the void.
The singularity fields
This is a multifaceted, subspacetime realm that exists and does not exist. The elves use their own energy as the base of balance in the realm, sealing the chaotic energy of time and chord in different planes of the past, present and future. It is also the place where the temperers tune. The giant broken clock also suggests that time stands still here. Of course, the field is not 100% stable, and certain combinations in tuning can affect the appearance of the field as a whole.

When the string field
In tuning, the permutations of the inspiration stones create a smokeball, and five of the same stone permutations create a rainbow orb. The rainbow sphere passively absorbs very small amounts of synchrony energy. So, when the two rainbow spheres combine their missions, there is a huge impact on the singularity field, which allows the tuner to enter another sub-plane field, the time string field. Everything here is between the real and the unreal, dreamlike, but also very unstable, so when you interrupt rhythm, you are forced to move out of the realm.

Law of the Lord stage
When the rhythm is completed, the spirits convert the rhythm into the energy of the healing chord, a process called the prayer dance. The prayer dance directly in the singularity realm is affected by the chaos energy that has not yet been repaired, so the elves need to pray on a specific law stage. The player as the rhythm tuner can enter the stage, however, in order to ensure 100% success of the dance, the rhythm tuner can only watch, not contact with the girl.

