This song uses the sound source of a synthesizer based on Kalimba, and is produced mainly with a mysterious sound that sinks into the deep sea.
All Kalimba sounds in the high register are tuned to the Solfeggio frequency, which has a good effect on the human body.

432hz is the base of classical music and is said to give the ultimate healing effect.
・639hz to keep balance of human relationships
・741hz that sheds toxins from cells
・ 852hz to awaken your intuition and imagination
・963hz connected with cosmic consciousness
・ Effective in purifying the mind 4096hz

It contains these frequencies and makes the song enter a deep meditative state.