Zongman: How Did the Promised Daily Life Become the End of the World?

Immediately after graduating from college, he developed a terminal illness named after himself and died on the way to seek medical treatment. When he came to his senses, he was now a high school student, and his teacher was Hiratsuka Shizuka? Wait, why am I a player! Isn't this the everyday world? Together with Hiratsuka Shizuka, the first game they entered was actually the world of Iron Castle! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.