I wonder what that means :|
Hmm, it's okay. Maybe next time, but thank you anyways
I'm home now, so here's a super long explanation because Mythology is my thaaang.
Tennyo ( heavenly maidens) are a subset of Tennin ( heavenly beings.) who serve the Bodhisattva in heaven ( basically gods in Buddhism.) They wear robes that give them the ability of flight called a Hagoromo, they are supposed to be feathered but more often then not they are drawn by artists as being long, loopy and sheer. They are also usually depicted with some sort of instrument, In a way they seem almost like Grecian muses-- talented, extremely beautiful and desirable. ( In western mythology, think Selkies or Swan maidens.)
Legend goes that one day a young man ( usually a fisherman) spots a flock of them bathing and struck by how beautiful they are ( or one in particular is) steals one of their robes and hides it. When finished, each one gathers their garments, adorns it and takes flight back to the heavenly realm until only one is left. Without the robe she is earth bound and presumably doomed to a mortal life.
She-- of course is panicked and begins to search for it relentlessly only to "bump" into the man who stole it who promises to help her in her plight (sneaky bastard.) Still unable to find it the maiden ends up marrying him ( sometimes she really falls in love, sometimes she doesn't.) and bares him children.
In some stories she happens upon the robe within their home on her own, in others she will hear one of the children singing about it and some way or another finds out where its hidden and returns to heaven. In the stories where she truly grew to love her husband and children she returns to visit on occasion, in the others she's never seen again.
I'm not sure if you're familiar with the story of Kaguya- but I'll do that really quick and explain why the two connect;
An old, childless bamboo cutter found a shining stalk of bamboo and cut it down only to find a baby girl about the size of his thumb inside. He took her home to his wife where-after every time he cut a stalk of bamboo gold would be found inside. As time passed the child he found grew into a beautiful young woman and despite the care he and his wife took to hide her from the outside world, news of her spread and suitors soon flocked from all over.
Five men came and to each she assigned an impossible task- a legendary item to be brought back to her; The robe of the fire-rat, the stone bowl of the buddha, the jeweled branch of a tree from Horei, the jewel from the neck of a dragon and finally the cowrie born from a swallow. All of them fail one way or another until the emperor himself arrives and asks for her. To him she gives no tasks but politely refuses the marriage on the grounds that she is not from his country.
More time passes still and each time she looks upon the full moon she is filled with sadness knowing her return is eminent, her depression continues until she finally breaks down and explains to her parents that she belongs to the City on the Moon ( or sometimes the Capital of the Moon) In some versions she was sent to earth to escape war, or to serve a punishment and the gold found was re-reimbursement for her care there.
Despite the emperor going through the trouble of sending soldiers to protect her and keep her on earth, people from the moon arrive to fetch her- she leaves her own robe to her parents, writes a note to the emperor and upon taking one sip of the elixir of life, sends the rest with the letter to the emperor. Once this was done, a new robe was placed upon her and all of her sorrow and love for the people on earth vanished and she returned to the moon.
Her earthly parents are left in sorrow and pine away in their depression at the end, the emperor also in sorrow and not desiring to live forever without seeing her has the elixir burned along with a letter on the highest peak in the land ( mt.Fuji) in the hopes that his words will reach the distant princess. its said that this is where Mt. Fuji got its name ( immortality) or from the soldiers (Mountain abounding with soldiers) from the soldiers going to carry out the emperors orders.
Kaguya from the traditional story DOES wear a heavenly robe, which seems to align her with Tennyo hence the naming of her son. It could also be an illusion to the chink in her armor- the hagoromo served as the tool to bind a tennyo to earth or send her away in Kaguya's case.
Kaguya from Naruto is very clearly affiliated with the moon, and as such is meant to invoke connotations of the legend. When you originally asked this question I wondered if Hamura,Tokyo had its own version of the celestial maiden story, but I couldn't find anything on it so it must be related to something else.
If you need anything else explained I'll try.