"I myself am someone researching the occult. It was a total coincidence that I listened to this show."

"Wanting to turn that coincidence into certainty, I sent you this letter."

"It's about the otherworld in Swallowstone Naturalis Historia that was mentioned on the show."

"It seems extremely similar to a certain otherworld I'm familiar with."

"A bamboo grove that leads people astray, an upside-down Japanese castle"

"A certain shrine with a big torii"

"Villagers walled in by nature, the children from the temple school"

"A religious war, the wrath of youkai and gods..."

"A rental bookshop flourishing with not even any e-books, and no air-conditioning anywhere."

"It was all in a dream, but the world was all real."