Abyssal Ships...those malevolent souls of sunken ships that materialize by possessing metal junks of ship's wreckage.Spirit(Soul) is at the HometownIn the past, five priestesses, possessing special power known as 「Thought Power」, were gathered from the whole country in order to purify those things.Through these quasi-war rituals, they purified the Abyssal Ships one after another.Mind(Power) is with the SkyBody(Metal) is on the SeaThose priestesses used their bodies as the medium to be possessed by ship's soul.