This door obviously doesn't lead to Auntie's place...
Nine Hells and Nine Springs, Netherworld.
Because ancient times favored burial, when digging graves, encountering underground water mixed with mud spurting out in a yellow color, people referred to Yellow Springs Country as the place where ancient souls return after death.
As for that Yellow Springs of SAYA, it's probably because his family used to be tomb raiders, or well diggers, or maybe there's a mud river at their doorstep or something. After all, surnames like Tamura and Matsushita are easy to guess...
Ahem, I've digressed, anyway, from the imagery captured by the flea-style drone camera passing through the door, it's indeed like an apocalyptic painting of Shura Hell.
The whole world was silent, covered in windblown dust and yellow earth, the earth was cracked, rivers dried up, the sky swirling with dust, yellow earth covering the ruins of devastated cities, a lifeless, completely dead world.
