Monkey D. Luffy's Second Gear is a technique that uses the power of the Gomu Gomu no Mi to enhance the user's speed and mobility. It was first seen in Luffy's fight against Blueno in the Water 7 arc. To activate Second Gear, Luffy rapidly pumps blood through his body, causing his veins to bulge and turn red. This increases his blood pressure and heart rate, which gives him a significant boost in speed and strength. However, Second Gear also puts a strain on Luffy's body, and he cannot use it for too long without risking injury. A fanart One Piece progress bar for YouTube with Monkey D. Luffy Second Gear Full.