Yuya accidentally angered his wife over a trivial matter, causing her to leave home. His sister-in-law, Natsu, stepped in to mediate and reconcile them. Grateful for her help, Yuya promised Natsu he would do anything to show his appreciation. The moment he made that promise, Natsu revealed her alluring pure white naked body in front of him, seducing him. Overwhelmed by her charming and provocative smile, Yuya tried to resist, but ultimately succumbed to her irresistible allure.