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Major plot spoilers follow.

The Aves High City Bombing incident was a suicide bombing attack orchestrated by human extremists on March 7th. This incident leads to the creation of the Earth Crawlers from the Hawk Party. The following month produces a truce between humans and birds, creating a separation of the two.

During the incident, Ichijou Utsuro loses both of his parents and sustains slight paralysis and impaired eyesight on the right side of his body.