It was a normal day; the sun rose from the East, and in the early morning, the birds sang and people headed for work. Ethan was visiting his mother when it happened. The Earth was consumed by a colossal, magical tower, and the only way to avoid being consumed by it was to claw their way up each and every one of its extremely brutal floors; at least there was a System to help them live, right...?

Wrong. There was a System to help Earth survive. Humanity is only one of many species chosen to be worthy of saving their planet, and the results are tutorials meant for wild animals- tutorials that humans would find difficult to survive with nothing more than the clothes on their backs. Ethan, his elderly dog, and a few others end up in one of the hardest ones there is.