Bōgyaku no Kokekko

Overview

Yuu Enji, a boy abandoned by his father, and the oldest kid in his foster home are fed up with adults like his selfish orphanage principal. His dream is to buy the orphanag​e, so that everyone there can live happily together. With that goal in mind, he decided to get a job, and went to his high school graduation. But from that day forward, the world suddenly changed! Adults have now morphed into giant chickens that attack children! Can Yuu protect the children during this crisis!? Includes extras 10.5 Egg and 20.5 Pure Human

Source: AniList