Tsutomu Senkawa is a high school senior focused on studying for his upcoming entrance exams. His quiet routine shatters when he witnesses an interplanetary criminal attempting to flee from a space agent named Birdy Cephon Altera. During the chaos of the escape, Tsutomu is caught in the crossfire and mortally wounded. To save his life, a radical procedure merges his consciousness with Birdy, forcing him to exist as a hybrid entity sharing her physical body.
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