In a wondrous land of beauty and supernatural wonders, this land is called “RuseGea.” The beautiful RuseGea possesses a supernatural power called “Manna.” Manna is like breath and fuel of all things in this world. It can be used in countless ways, even as a necessity in daily life. Earth, Water, Wind, Fire, Healing, Summon, Curse… Every living being here is born with at least one type of Manna. However… Ryhe Yhevok, a 27-year-old man without Manna, has to venture into the world for the first time after his mother's sudden passaway from a strange illness. He enters a big city to find a solution to the mystery of said disease, but instead he becomes the apprentice of the beautiful Mechanic Sage?! Beautiful, yes! But her mouth and words are anything but that! Not only was he so unfortunate by his own naive, but also the disappointment and heartbreaking truth he would face...... that one of the great sages has a mouth even sharper than an evil king!