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Based on the Pretty Little Liars series of young adult novels by Sara Shepard, the series follows the lives of four girls — Spencer, Hanna, Aria, and Emily — whose clique falls apart after the disappearance of their queen bee, Alison. One year later, they begin receiving messages from someone using the name "A" who threatens to expose their secrets — including long-hidden ones they thought only Alison knew.

Wako Taira is 31 years old. She works part-time at a cinema close to her home. Her boyfriend is Fu-kun and they have lived together for three years. She has never thought of breaking up with her boyfriend, considering her age. One day, she meets high school student Yumeaki Iko. She can't resist him. Wako Taira has an affair with Yumeaki Iko.

Fuutarou Uesugi is a poor, antisocial ace student who one day meets the rich transfer student Itsuki Nakano. They argue but when Uesugi realizes he is to be her tutor, he tries to get on better terms. While trying to do so he meets four other girls.

Love is as tough as it is sweet for a lovestruck teenager, whose relationship with her next-door neighbor transforms as they grow into adulthood.

A grieving woman magically travels through time to 1998, where she meets a man with an uncanny resemblance to her late love.