Might Sai was born as just Sai to an average shinobi family within Konohagakure just five years prior to the Fourth Shinobi World War. Sai was present for the Invasion of Pain—a mere Academy Student at the time—and was one of the students rescued by Konohamaru Sarutobi and then whisked away to a safe-zone near the Hokage Monument. As an Academy Student during the war, Sai was exposed to the events transpiring on the main battlefield and became enthralled with the heroism of Might Guy. Like Guy, he was a student who could neither preform ninjutsu nor genjutsu to any notable degree and, after learning of Guy's success in the Academy, dedicated himself to strictly taijutsu. It was then that he decided to add to his name.