The Endless World of Anime

[Anime Crossover Infinite Flow + Invincible Protagonist + Freedom of Choice + Crushing Weaknesses]

Once a time traveler, the protagonist of an era who endured endless hardships, he reached his peak but could not make any further progress. In order to break through to the highest level, he became the final villain. After failing, his true body returned to the past, erased his own consciousness and merged with his past self, and began an infinite journey through the mortal world in the chaotic space-time where he originally was.

Friendly reminder: This story is not for those with a saintly heart. The protagonist is inherently aloof and indifferent to everything, and there is no specific female lead; all the characters are just tools.