Yuusuke Yotsuka has always hated Tokyo, but especially the people who live there. He would rather thrive in a virtual world than try to get along with the people around him. At the end of a school day, he sees popular athlete Iu Shindou chatting with Kusue Hakozaki, who is spending less time at school due to an illness. But when he averts his eyes from the two and looks back, they have seemingly disappeared.
Just moments later, Yotsuya is in free fall and the world around him begins to change. He falls into a large pool of water and the first thing he sees when he regains consciousness is a collection of giant monsters. He soon finds out that he has been taken to a game world by Shindou and Hakozaki and that he has a task to complete within 14 days.
There is one thing that makes this world different from the real world: Anyone who dies will come back to life within 30 seconds, as long as a party member is alive. Yotsuya, Shindou and Hakozaki are assigned numerous tasks, whose difficulty increases over time, and try to discover the mystery behind the confusing game world.