Midori Maki, 52 years old. One night, while her son's girlfriend is visiting, she goes to the room to bring tea and discovers her son, devastated by a breakup, frantically masturbating. The room is littered with pornographic magazines, and seeing this, Midori assumes her son has fallen into a corrupt relationship and scolds him harshly. But as her son's lingering emotions and inner turmoil come to light, so too does the complex bond between mother and son—and the limits of that bond.