Kana Sato is a university biology teacher. She and Keisuke, a writer, are recently divorced. She spends her days on a dating app meeting married men and has a series of affairs. Struggling with a sexless marriage, Kana engages in casual relationships to learn more about sex and love. Hearing these men’s true feelings, Kana must face what she was hiding from herself.

Natsuko Kurata, a curator, has been divorced for three years. Natsuko is over 60 and thinks that love isn't for her anymore. But her friend Kaoru recommends an app and she goes on a date. Kosuke Hayami, a kind man, meets her at a café in Harajuku. They talk about their pasts and Natsuko tells him about the worst date she ever had. Hayami was smiling until...

Kengo and Mai have been married for three years. Mai used to work as a designer, suffers from depression due to issues at work. Nevertheless, Kengo tries his best to bring back Mai's smile, supporting her even though she can no longer work and showing her love as he usually does. Mai's spirit begins to improve thanks to Kengo's devotion, but what kind of future awaits them?

Momoko Shinohara, a TV reporter, feels that she has failed in love. She meets Yoji Suzuki one day. The two spend more and more time together. They stay at Momoko's house and go camping in the mountains. Although they have only known each other a short time, Yoji becomes Momoko's citadel. However, Yoji has a secret he is keeping from Momoko.

Emma is a British woman in Los Angeles trying to save money for a trip. While giving online lessons to international students, a Japanese man named Mamoru joins her class. Emma is shaken by a question from Mamoru. Feeling stuck in her life and unhappy with her ex-boyfriend, Emma finds new joy with Mamoru, but one day he suddenly tells her, "This is my last lesson."

Tamami is stuck in her job and life. One day, she hears a song from her youth and her mind goes back 15 years. In high school, the reserved Tamami meets Rin, who plays the piano. Through their shared love of music the two become friends, but drift apart. Now in her thirties, she discovers that Rin has become a musician when she posts a picture on social media.