Still Walking is a family drama about grown children visiting their elderly parents, which unfolds over one summer day. The aging parents have lived in the family home for decades. Their son and daughter return for a rare family reunion, bringing their own families with them. They have gathered to commemorate the tragic death of the eldest son, who drowned in an accident fifteen years ago. Although the roomy house is as comforting and unchanging as the mother's homemade feast, everyone in the family has subtly changed.

Ginko seems to be living the good life: She's the respectable owner of a neighborhood drug store in Tokyo, and her daughter Koharu is about to get married to a doctor. However, Koharu's wedding day also brings homes Ginko's younger brother Tetsuro, a failed actor and a hard drinker who shows up causing trouble. Having covered for him all her life, Ginko is ready to disown her burdensome younger brother, but some things are easier said than done...