I Signed into One Punch World and Became Invincible for 999 Days

Lin Chuan accidentally traveled to the world of "One Punch Man" and awakened a magical [Daily Sign-in System]. Sign in every day to get the powerful abilities of different heroes or monsters randomly! When the Vaccine Man attacks, he signs an A-level hero with the speed to dodge perfectly! The Deep Sea King attacks the city, and he signs the sexy prisoner's regenerative powers to stand and let you fight! Boros returns to Earth? It doesn't matter, sign up to Saitama level and kill everything with one punch! … From A level to S level, from ordinary hero to invincible powerhouse, after signing for 999 days, he turned out to be truly invincible! Lin Chuan: "Saitama, can I lend you a punch?" Saitama: "Huh?"