A high school kid dies in the first five minutes because he was in the wrong place. Birdy, the Federation agent who killed him, has to cram his consciousness into her body to keep him alive, now they share one form, and neither can tell anyone why. The show trades the usual "reluctant partners" setup for something meaner: two people who actively despise each other, trapped in genuine physical proximity, forced to solve crimes while Tsutomu's life literally depends on not getting caught. The comedy lands hardest when the stakes are highest. By the end, you understand why this pairing had to happen exactly this way, and why neither of them would choose it again.
Tsutomu is just another high school student grinding through exam prep when a chance encounter with a fleeing criminal turns into something far worse: accidental death. The silver lining comes courtesy of Birdy Cephon Altera, a Federation agent pursuing the guy, who offers Tsutomu an unconventional solution. His consciousness survives by merging with her body, creating an arrangement neither of them asked for. Now Tsutomu occupies the same physical space as an alien law enforcement officer, which means when Birdy springs into action chasing interplanetary fugitives across the city, Tsutomu is along for the ride whether he likes it or not. Their constant bickering and forced cooperation becomes the glue holding everything together as dangerous criminals and Federation business collide with school deadlines and the awkwardness of literally sharing a body. The show balances explosive sci-fi action sequences with genuine comedy born from their impossible situation. It's lighthearted enough to laugh at the absurdity but committed enough to the premise that the action actually matters.