Haruto is a young businessman whose game company struck it rich, giving him a fancy suburban home, a beautiful wife, Michiru, and a grade school daughter. But when the daughter is taken in a serial kidnapping, Haruto reassesses his priorities. Confronted with a series of challenges and revelations about people, he and Michiru fight to get their daughter back the only way they can: by themselves, in this non-stop thriller about family bonds under the most trying of circumstances.

A realistic portrayal of the daily struggles, pent-up frustrations and miscommunication of marital life that people everywhere can relate to, centered around the marriage of two couples. Mayumi Sato and her husband Hideaki are into their 13th year of marriage and have a teenage daughter. With childrearing nearly finished and family finances tight, Mayumi decides to return to work after more than a decade away to help with their daughter’s tuition at a private middle school. But she finds Hideaki to be uncooperative and fumes at her husband’s backward attitude. Meanwhile, the Nasuda family of Taro, wife Ayako, son Shingo and Taro’s parents forms the picture of a traditional Japanese household. Taro is uncontested master of the house, and Ayako dutifully attends to her husband’s every need without question. Then one day, the couple visit a model home showroom where Hideaki works. Hideaki is smitten by Ayako, who seems the polar opposite of his own wife, and a forbidden affair ensues.

Just where is Level 7 and what is it? Two completely distinct plot lines ultimately cross paths and converge on a heinous murder. A man and woman wake up in a condominium room but have no memory of anything. The only clue they have to their identity is a tattoo on their arms that reads, "Level 7." Meanwhile, in a separate location, a solitary elderly lady goes missing having left the message, "Once you arrive at Level 7, there is no return," prompting her granddaughter to begin a search for her whereabouts.

A man and a woman living on the same floor of an upscale condominium just happen to become acquainted with one other. In order to prove the notion that “there is only one destined soul mate for every person” the pair decides to try out a “Love Shuffle/lover swapping”. Eight individuals gather to play by the rule of “shuffling” partners every week. Is it love that connects them, or is it simply compatibility? Having opened the “Love Shuffle” Pandora’s box, what will become of their fate?