To explain Kidama-sama of Aogashima in detail:

A wood spirit from Aogashima in the Izu Islands, long honored by islanders as “Kidama-sama” or “Kodama-sama,” enshrined at small altars set at the roots of great cedars. The island forest drinks sea wind and volcanic breath, driving deep roots through shallow soil. The spirit dwelling there is not a mere echo, but an ancient memory woven from the age of the tree itself. At dawn mist, if you call its name before the shrine, the reply comes only once, a slightly damp sound, taken as a sign of assent. If it returns twice or thrice, uneven and jarring, it warns that the season is wrong—do not cut. Before felling wood, locals offer a handful of rice, sea salt, and a cup of shochu, tap the trunk three times, and state the reason and the count. Kidama-sama honors this rule: when respect is paid, it sets the wind fair, keeps blades from dulling, and prevents workers from losing their way. If slighted, the mountain’s sounds grow muddy, blades kick against knots, and toil is shadowed by illness. Its form is uncertain, yet elders speak of a “shadow of rings”: when the bark reddens in the evening glow, a single pale eye like a water mirror appears deep in the grain and melts away. Before great winds or earth-rumblings, pebbles at the shrine rearrange themselves, a sign of the forest’s breath in disorder; those who heed it halt farm and boat work and lessen harm. It is not closed to outsiders: give your name, bring salt as a gift, keep your voice low before the shrine, and the returning echo softens and the mountain path confuses less. Laughing and shouting bring a delayed, high, splintered reply that lingers in the ear and upsets your sense of direction. When a tree’s life nears its end, Kidama-sama may appear in dreams to say, “Now I change worlds.” Villagers take this as a good omen, planting three saplings after a fall and moving the shrine to the new root to carry the breath onward. Thus the island forest renews by generations, and the spirit moves without fading, a vivid afterimage of the old tree gods living strong on a sea-bound isle, quietly listening as a mediator between mountain rites and ocean sustenance.

To explain Southern Island Kinushi-Haunted Kodama in detail:

Among the kodama whose echoes are heard across Japan, a southern island variant dwelling especially in Okinawa’s Yanbaru and sacred utaki groves is known as the Kinushi-Haunted Kodama. As its name implies, it settles like a lord within each individual tree, living in sync with the tree’s breath, the flow of sap, and the spread of its roots. Old lore says that if a woodcutter lightly taps the trunk before the first axe bite and offers a name and prayer, the kodama will tune the sound within the wood, align the wind with the intended fall, and guide the work safely. Strike in silence, however, and the tree will creak and cry, hollow tones will stutter across the mountains, and within days the surrounding leaves will lose color as if scorched. On uneasy nights, a heavy thud may carry through the mountain village though no tree has fallen; this is said to be the cry of a Kinushi-Kodama in unbearable pain. The tree where that sound is heard will soon shed dieback from its crown, white mycelium will gather at the roots, and its life will end. Witnessing this, elders understood that sound is the true form of the kodama, and passed down taboos: do not raise your voice at the forest’s threshold, and when calling a tree by name, pause to await its answer. Though it has no body, at dusk the air around the roots will sometimes shimmer like water and a childlike laugh may echo twice or thrice; islanders take this as a good omen and offer salt and black sugar to that tree. If a small child naps in its shade, mosquitoes and midges keep away and the sea breeze softens. Elders say that when winds from beyond the sea make their rounds among the mountain gods, the kodama resonates with the wind and guards the village bounds. Often confused with mountain echoes, the Kinushi-Haunted Kodama differs in that it does more than repeat a voice: by the timing and tone of its reply it foretells fortune. A clear prompt note means a good day for work, a heavy delayed reply is a sign to rest, and a muffled response from within the trunk portends sickly leaves. The islands also keep rites for transplanting trees. On the eve of root-pruning, stroke the trunk three times and name the soil of the new site; the kodama will fold the root tips and slim itself so it will not thirst during the journey. Neglect this and hollow knocks will sound nightly at the new place and the household may fall to fever. In coastal banyans dwell playful spirits known as Kijimunā. In older thought, Kijimunā are those Kinushi-Kodama that took on a more human-like notion of form: the kodama is the voice of the roots, the Kijimunā the laughter of the branches. Both are tree divinities at heart, guiding the respectful and chastening the careless with sound. Thus in the southern island forests, sound is law, and people and trees have long lived by each other’s breath.