A high school girl Misa moved to a countryside. She hears a mysterious beat from a distance every night.

Three siblings share a home with their parents living a happy life. The oldest one is good-looking guy, which is something of a contrast from his younger brother who is at school. The youngest one is the girl and has two brothers to protect her. And then there is Sakura, the family's dog who is always by their side. The fate of this quirky but happy family changes drastically after Hajime, the family's hero-like figure, encounters a tragic accident...

After suffering through a long and unsuccessful series of fertility treatments, Satoko and her husband Kiyokazu make the decision to adopt a child. Six years after adopting a boy they named Asato, Satoko has quit her job to concentrate fully on her husband and son. The family lives a peaceful existence until the arrival of a stranger.

Akari is a first grade high school student. She is positive, realistic and outgoing with romance. Akari though is not good at expressing her feelings. She become friends with Yuna, who attends the same high school.

Makoto Takashima is a young security guard who's inherited a huge debt from his father. Desperate to pay back his debts – and to buy a proposal ring for his girlfriend Kiyomi – he agrees to do a lucrative job to a yakuza named Masui: stealing a stock prediction AI program from his company. When Makoto tries to extort more money from Masui, Masui kidnaps his little sister Yui. However, nothing is as it initially seems: the AI program is also targeted by a group of professional swindlers, a legendary killer-for-hire, and a young female assassin.