Isadora ranges in topics from blossom princesses to Aokigahara. The forest has a historical reputation as a home to yūrei: ghosts of the dead in Japanese mythology. In recent years, Aokigahara has become known as "the Suicide Forest", one of the world's most-used suicide sites.

Adam attacks some Nordic tales. In Norse mythology, Ratatoskr is a squirrel who runs up and down the world tree Yggdrasil to carry messages between the eagle perched atop Yggdrasil, and the serpent Níðhöggr, who dwells beneath one of the three roots of the tree.