Horigo and his wife desperately wanted a child but were unable to conceive. After undergoing infertility tests at the hospital, the wife, Mika, was diagnosed as infertile. The couple agonized over their situation and ultimately asked Shihori, Horigo's mother-in-law who lives with them, to carry a child for them through "surrogate pregnancy." This decision triggers a shocking drama, as a forbidden relationship develops between the son-in-law and his stepmother, leading to insemination and the birth of a new life.