The eldest son, Yohei, has recently graduated from college and started working at a company as a new hire. With outstanding performance, he has steadily advanced on the path of a corporate elite. However, in recent years, endless overtime has worn him down both mentally and physically, leaving him exhausted and prematurely aged. Meanwhile, the younger son, Yasuhiro, struggles through his student life, plagued by numerous worries and emotional distress. In their respective hardships, both brothers begin seeking comfort and solace in their mother, Miho Sakaki. Their dependency on her becomes the most important source of emotional support. As a result, they start craving deeper intimacy and healing from her. The bond with their mother is an irreplaceable treasure, and their desire for even greater affection grows stronger.