Kaoru, a mother, finds out that her precious only son, Tomoya, is being bullied by his classmate, Atsushi. Outraged, Kaoru tries to stop the bullying for her son's sake, but is asked to offer her body in return. She decides to offer her body for her son's Mirai, but she unconsciously moves her hips during the act. She can't hide her confusion at the fact that she is enjoying the pleasure even though she says it's for her son... Gradually, Kaoru can't forget Atsushi.