After traveling to Tang China to study, Kukai was the founder of the Shingon school of Buddhism. See how his return to a politically fraught Japan created the opportunity to spread his teachings.
Huh? I thought you were here to 
learn about esoteric Buddhism?
¿No viniste a aprender
el budismo esotérico?
Hã? Eu achei que estava aqui pra
aprender sobre o budismo, não é?