"I've been saving the world with 'ahn' (open mouth sounds)."

A commoner hero suddenly receives a divine oracle to save the people of the western continent where a terrible plague is spreading. This is a story about him working hard to feed the seed of the sacred tree from the east to the sacred tree in the south. "Wait, trees don't eat things through their mouths in the first place... what even is this 'aaah' supposed to mean..."