(Multiple heroines + invincible protagonist + humor + battles)
Lu Feng transmigrates to the world of pirates and encounters Princess Vivi, who is being hunted by one of Sir Crocodile's men. He thinks that having only just arrived in this world, he'll be casually killed by the assassins chasing her.
Fortunately, he obtains the Extreme Challenge System. Whenever an enemy he challenges manages to hurt him, his body grows larger. Every time his size doubles, his strength increases a hundredfold. He can also earn rewards by defeating enemies. For the sake of power and rewards, Lu Feng keeps challenging stronger foes.
Take an ordinary punch: size increases 1 time, strength increases 100 times.
Get hit by cannon fire repeatedly: size increases 30 times, strength increases 3,000 times.
Withstand Thunder Bagua once: size increases 600 times, strength increases 60,000 times.
Survive Zuo Wu's trampling: size increases 5,000 times, strength increases 500,000 times.
Survive ten blasts from an ancient weapon: size increases 1,000,000 times, strength increases 100 million times.
…
One day, after completing the Grand Line, Lu Feng, now 300,000 meters tall, sits on the Red Line and wonders: If a punch traveling at 3,000 times the speed of sound lands entirely within a five-millimeter area, could it shatter space…?
(The story gets exciting starting from Chapter 26. If you don't like the early pacing, feel free to skip ahead. If you're enjoying the book, please show your support!)
Not bad, but the male protagonist is a bit like Liu Xiahui, he only knows how to fight No, author, you're done now, you're awesome