Rino (34), a housewife, was having a happy married life like in a painting with her kind husband who works at a big company. One night however, they argue about having a baby. Rino has a “secret” by which she can't ever be positive about being pregnant, that being that she has a daughter whom she abandoned long ago. Her husband, who is frustrated with his relationship with Rino due to pressure from his mother goes drinking with the Hina, a new part-timer at the company, and they end up having an affair....