I Signed In for 999 Days in the One-Punch Man World and Became Invincible

Lin Chuan accidentally transmigrates into the world of One-Punch Man and awakens a miraculous Daily Sign-In System. Every day he signs in, he can randomly obtain the powerful abilities of different heroes or monsters! When Vaccine Man attacks, he signs in for the speed of an A-Class hero and dodges perfectly! When Deep Sea King attacks the city, he signs in for Puri-Puri Prisoner’s regenerative ability and lets the enemy beat him while he stands there! Boros has returned to Earth? No problem. He signs in for a Saitama-level punch and instantly obliterates everything! … From A-Class to S-Class, from ordinary heroes to invincible powerhouses, after 999 days of signing in, he really has become invincible! Lin Chuan: “Saitama, can I borrow one of your punches?” Saitama: “Huh?”