Mihane Yoshiyama (Yuina Kuroshima) is a 3rd grade high school student. She is a member of the photo club at her school. The day before her summer vacation, she smells a lavender scent in the science lab and she suddenly gains the ability to leap through time. Shohei Fukamachi (Fuma Kikuchi) is Mihane’s classmate. He actually came from the year 2122 and is a researcher. Shohei lost a drug that allows him to go back to 2122. In the meantime, Shohei hypnotizes those around him and lives as a high school student.
Mihane and Shohei become to have feelings for each other.
Tooru Igarashi (Kotaro Koizumi) is a lecturer with charisma, working at a prestigious preparatory school. Recently, he drinks a lot and his life falls apart. Maki Endo (Haruna Kawaguchi) is a student at a part-time high school. Every day, she is exhausted with working multiple jobs to cover her expenses. One day, Tooru and Maki happen to meet each other. Maki wants to graduate high school to get a regular job and asks Tooru to tutor her for her test–retest. After Tooru quit his prep school job, he has lost his pride and passion to teach. Tooru was also diagnosed to have only a year left to live. He decides to teach Maki and get her into the University of Tokyo.
Mina (Machiko Ono) and Shinji (Yosuke Eguchi) have been married for 10 years. Mina gives piano lessons at home and they have decided not to have a child until she wins an international music competition.
One day, Minda finds a boy in her yard. The boy is covered in dirt and expressionless. Mina learns later that the boy was abused by his parents and his parents did not show up. The boy goes to an orphanage. Several days later, the boy appears again in her yard. Shinji feels a sense of fate over the boy who has appeared in their yard two times. He begins to search secretly about special adoptions.
Koichi Hikuma (Akira Terao) was a saxophone player, but he suffers from the aftereffects of an accident. Due to that, he turned his back on music. Koichi Hikuma finds hope in the high school brand band. The band consists of problem students. Koichi struggles to instruct the brass band and to give them hope.
Misaki Sakurai (Mirei Kiritani) has not dated in a long time. She has focused on her work as a pâtissier to eventually run her own business. One day, she gets fired from work. She then meets her first love from high school Chiaki Shibasaki (Shohei Miura). Misaki Sakurai works part-time at Chiaki’s restaurant and also stays there. While she lives with Chiaki at his restaurant, she realizes that Chiaki's two younger brothers Toma (Shuhei Nomura) and Kanata (Kento Yamazaki) also live there.
Shinichi Todo (Tatsuya Fujiwara) is handsome and smart. He is loved by family, friends and his girlfriend. Everything in his life seems to go well, but, one day, someone with the same name is arrested. After that, his life smooth life changes. An imposter takes his life.
Yuiko Yoshioka (Mei Nagano) begins the first grade in high school. She gets sick with the cold and stays in bed. At that time, she gets a phone call from class president Matsubara. Yuiko becomes fluttered by his kind voice on the phone. The next day, she goes to school and meets Matsubara. He is a mysterious boy, wearing a paper bag over his head. Her high school days begin with pounding heart.