While Fushi began the episode in the form of the nameless boy, he is essentially a "blank slate" or an infant in a teenager’s body.

The Beholder notes that "Pain promotes growth". Fushi's multiple deaths by boulders and the bear accelerate his regeneration and learning.

Episode 2 of To Your Eternity ( Fumetsu no Anata e ), titled shifts the narrative from the solitary survival of the Arctic to the complex social structures of the tropical region, Ninannah. This episode is pivotal because it moves beyond Fushi's basic biological survival and introduces the concept of social humanity through the eyes of March, a young girl destined for sacrifice. The Collision of Innocence and Tradition

The episode introduces March, a spirited girl whose only dream is to "become a grown-up". This simple wish is contrasted with the brutal reality of her culture, which demands she be sacrificed to appease , a giant "demon bear".

March takes on a maternal role, giving Fushi his name—meaning "Immortal" —and teaching him fundamental human skills like eating with hands, basic speech, and the concept of affection.

March initially accepts her fate to protect her younger sister and her friend Lalah, who would be chosen in her place if she refused.

The contrast between the lush environment and the human ritual of sacrifice highlights that human-made threats can be as dangerous as natural ones.