An insane person: inherently opposer of the status quo, is abruptly transported into a realm known as 'Tutorial'.

Deprived of any guidance, they quickly grow infuriated. However, soon enough they discover the means to confront the 0th-Stage, and thereafter excitedly take on the challenge.

The difficulty opted for by the protagonist, though, soon proves why it's called 'Legendary'.

Nevertheless, although the difficulty achieves to pose threats to them at first; they also soon prove why they're the protagonist, quickly beating the stages in the most insane ways possible.

Growing at an absurd rate that amazes gods and clowns the death, what else can they do but to make use of their newly obtained power?