Kinshiro Toyama (Hiroshi Tamaki) is the new chief at Kitamachi police station. He is enthusiastic to solve cases which interests him. He bickers over pretty much everything with veteran detective Yozo Minami (Masahiro Takashima). Minori Aikawa (Miori Takimoto) is a rookie detective who wants to become a veteran detective.
Yoichi Haruno (Hiroshi Tamaki) is 35-years-old and works for a company. His wife, Chisato (Kana Kurashina), is 28-years-old. Before they had a child, their marriage life was easygoing. After having their child, their relationship changes. Yoichi feels that Chisato is cold to him, but he doesn't know why.
Botchan (Kazunari Ninomiya) has sense of strong justice and does not lie. He is offered a teaching job at a middle in a small village far away from his hometown of Tokyo. Botchan accepts the position and begins to work as a math teacher. The assistant principle there wields absolute power. Botchan has a hard time dealing with his fellow teachers and the students.
Takashi Hayama (Nijiro Murakami) is a third year high school student. He falls in love with Azusa Oribe (Akari Hayami) at first sight and they begin to date.
One day, Azusa tells Takashi "people who meet me, forget about me several hours later."
Takashi doesn't believe Azusa, but by chance he realizes that he forgot about Azusa. So he won't forget Azusa, Takashi begins to leave a note for himself and Azusa.
Hatori Matsuzaki (Mirei Kiritani) is a female high school student. She has a crush on her childhood friend Rita Terasaka (Kento Yamazaki) and believes he will eventually choose her as her heroine, but Rita Terasaka begins dating Miho Adachi. Meanwhile, the most popular male student, Kosuke Hiromitsu (Kentaro Sakaguchi) takes an interest in Hatori Matsuzaki.
When she was a middle school student, Futaba Yoshioka liked Kou Tanaka who was unlike the other boys and quite gentle. Kou Tanaka then moved away and they lost contact.
At the end of Futaba Yoshioka's first year as a high school student she meets Kou Tanaka again. Kou Tanaka’s name has changed to Kou Mabuchi and his personality seems different from his middle school days.
Kira Aso (Marie Iitoyo) is a high school student with an introverted personality. When she was a child, her father died in a car accident caused by a motorcycle gang. Now, she sketches the sea everyday during her spring break. One day, Rei Kashino (Taisuke Fujigaya) rides his motorcycle and sees Kira Aso sketching the sea. He sits next to her. Kira isn't used to talking to guys and isn't friendly to Rei Kashino.
The new semester begins. Kira Aso meets Rei Kashino as her classmate. Rei Kashino doesn't get interested in particular style of girls, but he becomes interested in Kira Aso. Harumi Sugihara (Hirona Yamazaki), who likes Rei, and Tatsuya Kida (Yu Inaba), who is Rei ’s friend, are surprised in Rei's interest for Kira.
Makio Kirishima (Masataka Kubota) graduated from the same middle school as Rei Kashino and transfers to the same high school as Rei. The relationship between Kira Aso and Rei Kashino changes.
Sayaka Kudo (Kasumi Arimura) is a 2nd grade high school student. She is a gal who wears miniskirts and has her hair dyed blonde. Even though she is a high school student, her actual academic grade level is on par with 4th grade elementary school students. During the summer, Sayaka attends a private institution. There, she meets Teacher Tsubota. Besides her mother, Teacher Tsubota is the first adult to praise her. Sayaka begins to change. She studies hard and eventually passes an entrance exam for Keio University.
Sharaku Homonji (Yuji Oda) is the eldest son of a distinguished family who has studied crime for generations. The eldest son from the Homonji family has tested for an IQ of 246 for generations and Sharaku Homonji possess an IQ of 246.
Soko Wato (Tao Tsuchiya) is a detective. One day, she is assigned to the investigation section #1. Her job there is not to investigate crimes, but to escort Sharaku.