human
Subaru:  Sighing deeply when he did not get the hoped-for response, Subaru grudgingly walked around the ruin—
gpt
Subaru:  “—Well, there’s an entrance…” About halfway around the ruin, Subaru spotted a set of moss-covered stairs. When he climbed the stairs, careful not to slip, he found an opening with a dimly lit passage within—no doubt continuing into the ruin. He’d found his entrance. Naturally, the interior of the ruin was not lit, and the corridor he saw from the entrance continued into darkness. Even when he timidly called out, he heard nothing but the lonely echo of his own voice. Put bluntly, he didn’t have a good premonition in the slightest, but it is said that one can only get a tiger cub by going into a tiger’s den.
human
Subaru:  “Not that I really want a tiger cub…but if it’s the girl who brought me here earlier, turning back now would be giving up the store.” Having come that far, Subaru did not doubt that the girl and the ruin were related. If the teleportation via the crystal was related to the girl as well, the ruin had to be related to the Sanctuary. In the first place, it should have been Emilia, the one possessing the crystal, who was teleported.
gpt
Subaru:  “Then it being me instead of Emilia wasn’t part of the plan…Whether snake or Oni, only way to know is to see what pops out…” The very fact that he’d been teleported had already limited their options. With no clear way to rendezvous with Emilia, Subaru decided it was best to accept the invitation and play along for the moment.
human
Subaru:  “…” Breathing deep, Subaru clenched his teeth and stepped into the ruin. He employed the trick of keeping his right hand constantly against a wall to never lose his way in the dark. The sensation against his hand was less of a stone wall than of the slender, delicate vines covering it. The vines had overgrown the passage so thickly that it was hard to tell where the original wall stood, and it felt more like the artery of a living entity—the bizarre atmosphere of the ruin itself made him feel like he was entering the body of some giant creature.
gpt
Subaru:  “…” The only things he could hear in the darkness were his own breathing, his loudly beating heart, and his shoes. He had lost his sense of sight due to lack of light, and the cold, serene air robbed him of all use of his nose. His sense of hearing loomed large in his mind, but at some point, he’d lost track of the wall that he’d been touching. The feeling on his tongue was that of air mixed with sand and dust. Tasting nothing despite the sensation, Subaru relied more and more on his sense of hearing. The sounds of his shoes, his heartbeats, and his breathing were the only things he could depend on.