Mie’s (Haru) father died during the aftermath of the 2011 Tōhoku earthquake and tsunami. One day, she finds a bundle of unsent New Year’s cards, which languished there for 28 years. To find out why the cards were never sent, Mie tracks down Haruhiko Sakacho (Kiichi Nakai). Haruhiko played on the same high school baseball team with her father. Mie eventually gathers together her father's former teammates to play in the Masters Koshien (a senior league baseball tournament). Mie also uncovers a truth about her father and the baseball team.

Second year high school student Kodaka Hasegawa has transferred to his new school about a month ago, but he still hasn't made any friends. Kodaka Hasegawa was born from a Japanese father and a British mother. Because of his appearance, people think Kodaka Hasegawa is a troubled kid. One day, Kodaka Hasegawa sees classmate Yozora Mikazuki pleasantly talking to herself. Kodaka Hasegawa talks with her about how to make friends. To make friends, Yozora Mikazuki decides to form the Neighbor's Club and forces Kodaka to enroll in the club.