Seventeen-year-old Haruo spends all his waking hours online, fixated on the endangered Japanese crested ibis, Nipponia Nippon. Alone in his Tokyo apartment, living off his parents' indulgence, he descends into a fantasy world where he alone shares a bond with the last of these noble birds, their lives caged in the national conservation centre.

Haruo's destiny becomes clear. He will free the birds-alive or dead-from an undeserving civilization. As Haruo's emotional state grows increasingly erratic, he searches the internet for weapons and prepares for the night of reckoning.