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Umimachi Diary (Japanese: 海街diary, lit. “Seaside Town Diary”) is a Japanese manga series written and illustrated by Akimi Yoshida. It was serialized in Shogakukan‘s josei manga magazine Monthly Flowers from the August 2006 issue to the August 2018 issue (both sold on June 28 of their respective years).

A film adaptation titled Our Little Sister, directed by Hirokazu Kore-eda and starring Suzu Hirose, was first announced in the June 2014 issue of Monthly Flowers. The film was released on June 13, 2015.

A spin-off manga series titled Utagawa Hyakkei has been serialized in Monthly Flowers since July 26, 2019.

Characters

Sachi Kōda (香田幸, Kōda Sachi): Portrayed by: Haruka Ayase; The eldest sister of the Kōda family. She is 29 years old. She works as a nurse in a hospital. Very serious and reliable.
Yoshino Kōda (香田佳乃, Kōda Yoshino): Portrayed by: Masami Nagasawa; Second sister of the Kōda family. She is 22 years old. She works as an office lady in a bank. She loves drinking alcohol and is pretty embarrassing when she gets drunk. She often dates young, handsome boys. Once, she dated Tomoaki Fujii, one of the protagonists of Lovers’ Kiss (an older manga series by Akimi Yoshida, also set in Kamakura).
Chika Kōda (香田千佳, Kōda Chika): Portrayed by: Kaho; The younger sister of Kōda family. She is 19 years old. She works in a sports equipment shop.
Suzu Asano (浅野すず, Asano Suzu): Portrayed by: Suzu Hirose; She shares the same father as the Kōda sisters. She is 13 years old and still in junior high school. She is very reliable and serious, which caught Sachi’s attention. She lived in Sendai with her father and mother, but after her mother’s death, her father remarried a woman named Yōko in Yamagata. She met her half-sisters at her father’s funeral, and moved to Kamakura to live with them. She is very good at soccer.

Volumes

No.	Release date	ISBN
1	April 26, 2007	978-4-09-167025-0
2	October 10, 2008	978-4-09-167037-3
3	February 10, 2010	978-4-09-167040-3
4	August 10, 2011	978-4-09-167048-9
5	December 10, 2012	978-4-09-167053-3
6	July 10, 2014	978-4-09-167058-8
7	January 8, 2016	978-4-09-167073-1
8	April 10, 2017	978-4-09-167078-6
9	December 10, 2018	978-4-09-167088-5

Reception

Umimachi Diary won the Excellence Prize for manga at the 2007 Japan Media Arts Festival. It was also nominated for the 1st Manga Taishō (Cartoon Grand Prize), where it came in 3rd place, and won the 6th Manga Taishō in 2013. It was nominated for the 12th Tezuka Osamu Cultural Prize in 2008, where it came in 2nd place; and for the 13th Tezuka Osamu Cultural Prize in 2009. In 2016, the manga won the 61st Shogakukan Manga Award in the General category, sharing it with Sunny. In 2019, along with Demon Slayer: Kimetsu no Yaiba, Umimachi Diary ranked #10 on the 19th “Book of the Year” list by Da Vinci magazine.

海街diary
Umimachi Diary
Cover of the first tankōbon volume
Manga
Written by	Akimi Yoshida
Published by	Shogakukan
Magazine	Monthly Flowers
Demographic	Josei
Original run	June 28, 2006 – June 28, 2018
Volumes	9
Manga
Utagawa Hyakkei
Written by	Akimi Yoshida
Published by	Shogakukan
Magazine	Monthly Flowers
Demographic	Josei
Original run	July 26, 2019 – present
Live-action film
Our Little Sister (2015)