Originally Posted by
Comun
On Day 8 of Arcueid's route, Arihiko tells Shiki some rumors about how a group of almost 30 delinquents used to gather in the wrecks of a burned hospital in Kushizuka, but went missing one day. Shiki goes there immediately to look for Dead, but found nothing.
On Day 8 of Ciel's route, Shiki follows Ciel while she's looking for potential vampire lairs and they go to this same hospital. Ciel concludes that the place used to be a lair, but was completely abandoned so long ago that the vampire stains on the place were already harmless.
And then we never hear about the place again, at least until Red Garden. The scenes seem a bit random with just Blue Glass Moon context, but there's a lot to note in them.
1) Roa's lair was under the school because that's close to his body's residence and Vlov's was under the department store because that's close to Roa. Roa had no reason to build a second lair two train stations away from home, and Vlov got to Japan too recently to be involved in the case Arihiko talked about. That leaves Arach as our only reasonable vampire candidate to control the hospital.
2) In both scenes, Shiki's narration takes a sudden tone of "I want to get out of here". In Arcueid's route, he payed a train and a bus to get there, but only took one look inside and called it a day, no sunk cost fallacy pushing him further in. In Ciel's route, after Ciel was done looking, Shiki gave the player the choices of "we must leave / I want to go leave / we can leave now". Shiki is subconsciously repulsed by this hospital, which gets you wondering if it's the same hospital he stayed at when he got his eyes.
3) In the scenes, we only see the hospital burned, but in the CG Gallery, there's a non-burned version of the hospital, with a big sign fully readable as "Saiki Memorial Hospital". We can easily assumed there was one Saiki in command who burned along his hospital.
4) The two scenes use different CGs, with the Ciel version having more collapsed parts despite both visits happening on the same day. This means the extra damage in Ciel's route is tied to the route differences. I'm honestly pretty confused to what could be the cause of this, but I found one decent enough theory out there. In Arc's route, Satsuki disappears completely after Day 2, but in Ciel's route, she comes back to school on Day 11 looking fine. So the idea is that Satsuki didn't survive in Arc's route, but survived and damaged the hospital she was hiding in while she was first getting used to her new body in Ciel's, and the burned hospital will be her hang out place in her own route. At the very least, the background for her scene on the Red Garden trailer seems like it could be the hospital's roof.
Putting 1 and 2 together, we get the conclusion that there was a vampire incident in Shiki's childhood hospital, which explains his multiple internal slips of the tongue in the Vlov fights. Putting 1 and 3 together, we get a line drawing both of our new Akiha-adjacent characters together. Putting 2 and 3 together, we get the not really game-changing idea that Makihisa went to Gotou (and Arach?) when he needed oni-related injuries treated.
4 doesn't really connect to anything as far I can tell, unless Arach will be the villain of Satsuki's route or something.