Slaughtering the Japanese from the Start

(I Observe) Used to investigate information. (Speed Control) Can accelerate anything that can be measured as fast or slow. Chen Guan transmigrated into the War of Resistance Against Japan from the start. With his newly awakened Speed Control and I Observe abilities, he killed more than a dozen Japanese soldiers. He grew stronger at a furious pace over the next ten days, then flew straight to the homeland of the Japanese on the final two days to begin his path to greater strength. Next, he'll transmigrate into all kinds of modified worlds, such as a One Piece world where everyone has been powered up. There, he can encounter powerful fighters from almost every era, and even their abilities have been enhanced by other transmigrators. It's all utterly bizarre.