Takeshi Hashimoto, on the brink of turning 30, struggles with insomnia. He finds himself repeatedly dreaming the same dream. Despite seeming to have a successful career and personal life, Takeshi feels stifled and stuck in his current existence. When his close friend and colleague, Saeki, offers him some advice, Takeshi decides to try changing his approach to life. However, the next day, Saeki suddenly takes his own life, leaving Takeshi even more bewildered. Out of the blue, a girl named Sai and a mysterious man named Hōsaku—whom Sai calls her brother—appear in Takeshi's life. Their natural and intriguing presence helps Takeshi slowly reconnect with himself. One day, after receiving a promotion offer, Takeshi decides to turn it down after much thought. “I want to change the way I’m working…” he says. As he begins to notice small changes within himself, he starts to forge his own path.

Noboru is a high school student who isn't popular at all. He looks up to senior student Miyazaki who is one of the most popular guys at school. Miyazaki has two girlfriends: Momose and Tetsuko. Momose and Tetsuko have totally different personalities. Momose is bright and Tetsuko is a popular student from a wealthy family. One day, Miyazaki is caught with Momose. To keep his relationship with Tetsuko, Miyazaki asks Noboru and Momose to pretend they are dating. They both agree due to their affections for Miyazaki. Noboru and Momose begin to act like a couple in front others and soon Noboru begins to develop feelings for Momose, who is still in love with Miyazaki.