I Became the Sole Survivor of the Apocalypse-Class Tower

‘The Tower of Apocalypse.’ Even the first vanguard of ten, who were called the strongest in the world, failed. Even the SSS-rank awakeners, of whom there are only 100 on Earth, gave up. Survival rate: zero. The worst tower in the world, where humanity couldn't even conquer the first floor. I thought it had nothing to do with me. Because I was confident I could live a good life without bothering to challenge such hellish difficulty. —If you do not go to the Tower of Apocalypse, the Earth will perish in two days. “What?” And so, I became the sole challenger of the apocalypse-class tower. ……No. To be more precise, it would be better to call me the sole survivor. Please, save me. #...