The year is 20XX. Winter has just begun.

Coming from who knows where, ”that” arrives, marking the end of normal life. Falling in love for the first time, there are still those who dont know. There are those who have found the reason to stay alive and those who havent; either way, everyone are torn apart equally. Still warm bodies are rolling, the bodies which used to be living turns into ”those”, breaking the world around them. The future of the world crumbles before people´s eyes. Snow fell from the cloudy sky that day. For those young people, the time of barely clinging to life began.

And so those strange creatures took the world by storm. Humans are being hunted and turned into zombies or used as hosts for parasitic tentacle organisms. As the global epidemic throws the world into panic, Houichi, his close friends, and teachers barricade themselves inside the school.

However, the creatures gradually make their way into the campus and start attacking the survivors. Those who are attacked surrender themselves to pleasure and begin to turn…