A letter comes to three sterns of Kohda in Kamakur, with the news of the death of their father. The Father, whom they did not see since he divorced and left the house 15 years ago. Despite the indifference to their father, Esino, the middle of the three, and Chik, the youngest, go to Yamagat to attend her funeral at the request of Sachi's older sister. There they meet Suzu, their young and reliable step sister. Umimachi Diary won a prize for outstanding manga achievements for 2007 Japan Media Arts Festival Awards. He was also nominated for the 1st manga of Tais, where he took the 3rd place, on the 12th cultural award of Tedzuka Osama, where he took the 2nd place, and on the 13th cultural award of Tezuka Osamu.