Float Island Harbor is characterized by tranquil waters and an array of spirits, including the notable ghost of a drowned person. The harbor serves as a site for spiritual encounters and is linked to historic tragic events. It is significant for the exploration of spiritual phenomena, with Shiba Midori discussing her experiences with various spirits, especially the ghost.
The harbor's reputation for harboring spirits shapes the understanding of spiritual matters for those who visit, contributing to its enigmatic presence. Midori's reference to the drowned person's ghost evokes thoughts of death and the afterlife, highlighting the harbor's mysterious and potentially unsettling nature.