I Kept Pressing the 100-Million-Year Button and Came Out on Top

The button sends the weak swordsman into a time-frozen training space where he experiences 100 million subjective years of practice. Almost no time passes in the outside world, allowing him to return with extraordinary skill.

The protagonist begins as a swordsman who is far weaker than the elite fighters around him. His central advantage comes from enduring repeated training and turning an absurd time scale into disciplined combat ability.

No. The premise uses subjective time inside a special frozen space, so the protagonist experiences the training while the outside world advances much more slowly. The contrast between internal practice and external time drives the power fantasy.

The Japanese title is Hyaku-oku-nen Button wo Renda shita Ore wa, Kizuitara Saikyou ni Natteita. Its premise centers on repeated use of the 100-million-year button and the resulting rise from weakness to overwhelming strength.