Young Man / Great-Grandfather in Mirai
Spoiler note: Spoiler-light: this guide discusses the premise, family themes, and broad emotional arc of the film without treating the ending as a twist recap.
Young Man / Great-Grandfather in Mirai
A younger version of Kun’s great-grandfather, seen during one of the film’s key family-history encounters.

Who Young Man / Great-Grandfather is
A younger version of Kun’s great-grandfather, seen during one of the film’s key family-history encounters.
Personality
Confident, daring, stylish, and quietly wounded by the past. He teaches through motion more than lectures.
Abilities, powers, or symbolic function
His strength is resilience: he carries the memory of wartime injury and shows Kun courage through riding, balance, and forward movement.
Story relevance
The great-grandfather sequence connects Kun’s small present-day fears to the choices and survival of earlier generations.
Key facts
- Appears in Mamoru Hosoda’s 2018 feature film Mirai no Mirai.
- Connected to Kun’s understanding of siblinghood, memory, or generational family identity.
- Best read through the film’s domestic fantasy lens rather than action-anime power scaling.
Related Mirai character cards
Kun OotaThe four-year-old center of the film, Kun begins as a train-loving only child who feels displaced when baby Mirai arrives.
Mirai OotaKun’s baby sister in the present and the confident older girl who appears from the future.
YukkoThe family dog, reimagined through Kun’s magical perspective as a jealous older member of the household.
JijiKun and Mirai’s grandfather, part of the wider family network surrounding the house.