Climbing The Tower With Maniacs
A young man plagued by constant nightmares wakes up one day only to see his apartment getting destroyed and himself being summoned into a mysterious trial to enter a tower known as the "Cronolith."
'I finally lost my mind, did I not?' was his first thought, until strange events began unfolding and his fate crossed with a series of completely insane people.
A man suffering from protagonist syndrome who barely seems to know how to act, a mysterious old man with a dark past, a foul-tempered swordsman who insists in appearing randomly despite being absurdly powerful, and many more.
Even so, he will soon face a dilemma: return to a planet where nothing awaits him, or continue climbing the tower, abandon rationality, and finally become insane himself.