Hiroyuki Kuroda

Devoted to becoming an international lawyer, Ayukawa Wakaba is full of ambition. Her hard work pays off when she lands a job at an international law firm, but to her disappointment, the first prestigious assignment that is given to her is to babysit the boss' 5 year old daughter, Hinata. Wakaba loathes kids and nursing, but unwillingly takes on the job as she is fixated on wealth and success. One day when she goes to a preschool to pick up Hinata, she meets a man named Yamada Sota. Sota is a man without higher education, wealth, or a future goal, someone that Wakaba absolutely cannot stand, the complete opposite of her ideals. Once again, contrary to her will, she ends up looking after Hinata and a few other kids along with Sota. Despite being exhausted from all the first-time experiences in child care, Wakaba begins to realize what is truly important to her.

Sawako (Ryoko Hirosue) was dumped by her husband and since then she has raised her three sons alone. One day, she happens to meet a young man (Sota Fukushi) who is dying. She falls in love with him at first sight. The young man also suffers from memory loss. Sawako names him Hoshio. Taking advantage of his memory loss, she decides to make him live with her and as the father of her three sons. Now, Sawako, her three sons, her grandmother and Hoshio all live together. Sawako hopes Hoshio never regains his memory. Hoshio also begins to develop feelings for her. Whenever Sawako has troubles, Hoshio helps her out with his mysterious ability. Hoshio's past is also a mysterious. A mystery that is finally revealed.

One day, five kindergarten children suddenly disappear from a kindergarten in Tokyo, sending their teachers and parents into a panic. The five of them are connecting on trains and headed to an unfamiliar place for some purpose.