Synopsis:

Hikaru, a lonely young high school student, loses consciousness during a school trip because of an entity from space. When she wakes up, she realizes that she is no longer “alone” and that a voice rings in her head. This entity has seized his body and asks him to cooperate in order to carry out a mission: to destroy the MAELSTRÖM hidden in a soul on Earth. Hikaru will then have to cooperate with his alien host to save Earth from this scourge.