As marital strife, mounting abuse, and continual moving take their toll, the boy tries to escape, either by running away on trains, or by retreating into a sci-fi fantasy he has constructed for his little brother and himself. Finally, in snowy Hokkaidō, the law finally catches up when the little brother unwittingly causes a fatal car accident.
As marital problems, escalating abuse, and frequent relocation take their toll, the boy seeks escape through running away on trains or immersing himself in a fictional world he has created with his younger sibling.  In Hokkaido's snowy landscape, law enforcement intervenes after the younger brother causes a fatal car accident.