At its core, the narrative plays with the visual and psychological impact of a sibling who has outgrown their natural proportions. While the title suggests a slice-of-life domesticity, the "Maji de Dekai" (seriously big) element introduces a surrealist physical presence. This scale difference often serves as a metaphor for the loss of control or the shifting power dynamics between a protective older sister and a younger brother who has become physically imposing. The Appeal of the "Giant" Trope