Akihabara Layer
An abandoned station that once existed called Manseibashi Station. Near that station that still quietly exists, there is an underground space that continues forever.
Hastur: An Evil Deity Who Guards an Obelisk
"Obelisks" are mysterious pillars that send souls from the Mortal World to Heaven. The first of the four obelisks is guarded by a gigantic evil deity. He uses philosophic words, which suggests that he is highly intelligent.
Minakami Layer
Minakamiyama was known for being a military facility during WWII. It has an underground tunnel that goes deep into the ground that is currently off-limits.
Cthugha: An Evil Deity Who Guards an Obelisk
A brazen demon who wields the power of fire. As a hot-head, he doesn't listen to what others have to say and is quick to resort to violence.
Hayato finds the "Key of Cthaat Aquadingen" in Minakami. Lua tells Hayato that this must have something to do with a layer. The two then follow an odd rumor to Umeda, where a gigantic underground city awaits them. After gaining information about "the door that does not open," Hayato and Lua confirm that it leads to a layer.
Umeda Layer
Umeda, Osaka, is the location of an enormous underground city. "The door that does not open" leads to an underground empire, which no one knows about.
Dagon: An Evil Deity Who Guards an Obelisk
An evil deity who is on Cthulhu's side. Dagon is the leader of the Deep Ones, and is Cthulhu's most loyal ally. He prefers to be underwater, and does not show himself very often. He is an Ocean God who has the head and scales of a fish, and many of his followers have the same characteristics.
Hayato and Lua arrive at Mount Fuji, chasing after Balucia. As they continue their investigation of a mysterious rumor, they come across another layer. Deep within this layer, the two of them meet Balucia and the evil deity, Cthulhu.
Mount Fuji Layer
The sacred mountain of Fuji has been climbed by countless people since ancient times, but the forest at the foot of the mountain swallows lost travelers, never to be seen again. Because of that, an altar was set up for people to grieve the dead.
Cthulhu: An Evil Deity Who Guards an Obelisk
His true name is a collection of sounds that are impossible for human vocal chords to produce. He has come from the depths to defeat God in order to become God himself. He wields the power of wood.