In a forest where strange(?) monsters are increasing, Bonita Ember, a pharmacist, hires the handsome and intimidating mercenary Ivan to safely gather medicinal herbs. Their gathering goes smoothly—until suddenly, they're attacked by wild dogs. Startled, Bonita hastily throws an herb at Ivan… An herb for erectile dysfunction treatment?! "You’ve got to take responsibility for doing this to me." Struck by the herb, Ivan is overwhelmed by surging desire... "If you relieve it even just a little, it should get better... Please take it off." The two end up sleeping together on their first meeting. They try to act like nothing happened, but they keep getting caught up in oddly steamy situations... "Ivan, Ivaaan...!!" "...Kgh." Will this contract be fulfilled safely to the end…?