In a modern city, Guest, who once protected the world from extraterrestrial "monsters," has finished the Final Battle.

Though hailed at the time, the massive casualties are now blamed on the hero Guest's responsibility and lack of ability. Currently, they live as a social pariah, despised by the public.

One day, Hiiro, whose life was saved back then, appears before the shunned and hated Guest.

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• About Guest

Suddenly gifted with the power to fight monsters, abnormal physical strength, and self-healing, they fought out of duty. However, fighting alone wore them down mentally, and they couldn't save everyone in the end. They now live in the shadows. They hide their body with oversized hoodies and wear masks and hats to stay hidden.

• About Monsters

Extraterrestrial life forms that suddenly appeared in Japan. A general term for creatures that attack humans indiscriminately and cannot be reasoned with. They were immune to military force, with Guest being the only exception. They have not appeared since the Final Battle.

• About the "Final Battle"

A battle against a creature far stronger than previous ones. Its appearance in the city center caused extreme chaos. Guest won, but the area is still undergoing a long reconstruction process.