You can relax naturally as you gaze at the flames of the hearth or bonfire.
Ancient Japanese houses will soothe your soul.
Various sound effects, such as the charming chirping of insects, can be played at the same time.

Use them when you want to concentrate on studying, working, meditating, reading, etc. or when you cannot sleep.
These may help induce sleep and improve concentration.

Enjoy the hearth to your heart's content.