Mie’s father passed away in the wake of the 2011 Tōhoku earthquake and tsunami. One day, she stumbles upon a stack of New Year’s cards that had remained unsent for 28 years. Curious about the reason behind this, Mie seeks out Haruhiko Sakacho, who was on the same high school baseball team as her father. Mie manages to reunite her father’s old teammates to participate in the Masters Koshien, a senior league baseball tournament. Along the way, she also discovers a hidden truth about her father and his baseball team.