It is 2019 and aliens have nearly annihilated the human race with their powerful abilities to transform. As humanity faces extinction, the aliens settle on Earth and even fully embrace human culture by living like humans once did. Today, it is alien student Yohei's turn to feed the two chickens kept at his school. However, unbeknownst to him, those two chickens are hiding a surprising secret.

Ibuki makes a big decision on the eve of his graduation and invites Yuri to walk home with him. Since he will attend college abroad, this will be the last time he will see her. Determined to confess his long-standing love for her, he gathers his courage, only to be interrupted by dire situations. However, those are the least of his priorities right now.