Karen, married to her stepfather despite having children together, desperately strives to be a true mother figure. In their newfound family life, she tries to build strong relationships not only with her stepson but also other classmates' parents. However, this leads to conflicts at times... Yet, she remains hopeful that happiness lies ahead in their future home. One day during a trip arranged by another parental friend, Karen learns that her stepson has gotten into an accident. Feeling responsible for both him and their family, she reluctantly accepts his actions but wonders what consequences may arise from this decision.

連れ子のいる主人と結婚したカレンは本当の母親になるために必死だった。突如できた家庭、義理の息子とも良好な関係を築こうとするあまり、他の同級生の保護者とトラブルになることも…。それでもカレンはその先に幸せな家庭があると信じて日々を過ごしていて…。しかしある日、保護者の交友で誘われた旅行先で義息子が事故を起こしたと告げられる。「息子と、家庭の為なら―。」と屈辱の中、その行為を受け入れるのだが…。