A man continually trying and failing to get his wife to stay dead; a self-absorbed ad agency creative director who comes up with one unworkable inane idea after another; a British hitman who only wants to know everyone's function in life; and an unfortunate office worker and father whose brain is left scrambled after a stage hypnotist is murdered in mid-performance. Starting off as unrelated plot lines, they intertwine with each other as they continue on their respective ways.

In Kagoshima, the boy Koichi lives with his mother Nozomi in the house of his grandparents. Koichi misses his younger brother Ryunosuke and his father Kenji, who live in Fukuoka, and he dreams on his family coming together again. One day, Koichi overhears that the energy released by two bullet trains passing by each other would grant wishes and he invites his two best friends, Tasuku and Makoto, to travel to the point of intersection of the two trains. Koichi also tells his plan to Ryunosuke that invites his three best friends to join him. Soon the seven children arrive to the meeting point in the journey of discoveries.

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.