Natsumi is proposed to by Yamato, a man who aims to become a fisherman to succeed his father. Her grandmother Kiyo, who raised her since a young age, broke her legs and uses a wheelchair now. Kiyo lives in a facility where Natsumi visits to tell her about the wedding. Natsumi suggests the idea of Kiyo walking along the wedding aisle with her, which encourages the weak Kiyo. With that mindset, Kiyo regains hope and tries to get better with the help of Natsumi.