Spoiler for Episode titles 1-4:
第1話「開かずの間」
第2話「白狐の祟り」
第3話「トンネルの闇」
第4話「魂をつなぐもの~憑依~」
Episode 1: "Akazu no ma" / "The locked room"
Episode 2: "Shirogitsune no tatari" / "Curse of the White Fox"
Episode 3: "Tunnel no Yami" / "Darkness of the tunnel"
Episode 4: "Tamashii wo tsunagu mono ~Hyoui~" / "Connected to the spirits ~Possession~"
Lets see....
Eps 1 & 3 are from the first novel and ep 4 begins novel 2 material. Not sure where the white fox story is from though.
This bodes well for a possible second series.
Doesn't look like they're going down the manga route.
The Opening theme "Key" will be sung by Jangled Cat/Ono Daisuke and is composed by R · O · N.
The Ending theme "Missing You" is by Komine Lisa
R · O · N is also the composer for the soundtrack.