[rogerpepitone]

Spoiler for Valentine's hypothesis:

If the first part ultimately refers to Rokkenjima (Literally, "Six houses island")...
Could Eva have gone to the atlas to look up the old name?
".....In ancient times, Rokkenjima was feared, and called 'Azukishima' (Azuki Bean Island). The 'Azuki' is said to be a mispronounced form of 'Akujiki' and in fact it was called 'Akujikishima' (Evil Appetite Island). That is what is told among the fishermen."
"I've also heard that. It's that story about, since there are lots of sunken rocks and shipwrecks around here, the fishermen got afraid and unreasonably didn't approach here, right?"
"......Evil spirits settled down in Akujikishima and continued to eat the souls of people since ancient times. ...There were lots of people related to this island who were dispossessed of their lives."
(「……六軒島は太古の昔、小豆島と呼ばれて恐れられてきました。@アズキはアクジキが訛ったものと言われ 、本当は悪食島と呼ばれていたのだと、漁民たちの間では伝えられておりました。」
「前にも聞いたよ。@この辺は暗礁が多くて、海難事故が多かったから、漁民たちが恐れてむやみに近付かなか ったって話だろ？」
「……悪食島には悪霊が住み着いていて、太古の昔から人々の魂を食らい続けてきました。@…この島に関わり 、命を奪われた人間はあまりにも多いのです。」

What's the Japanese spelling of Rokkenjima and Akujikishima?
If we take "Six houses" literally, how many buildings are on Rokkenjima?
- Mansion
- Secret Mansion (Kuwadorian - Nine Birds' Retreat)
- Guest House (Toraian - Visitor's Retreat)
- Chapel