Onii-chan ni Natchatta

The anime centers on a young boy's confusion regarding the adoration directed towards a baby. He observes the women around him showering the infant with attention, a behavior he finds puzzling. The baby, in his eyes, is simply loud, prone to crying, and incapable of performing any entertaining feats. He can't comprehend the appeal. This all changes when he himself is addressed as "Onii-chan," a term of endearment and respect. This title, bestowed upon him in relation to the baby, shifts his perspective. He begins to understand the value of having a baby around, recognizing the significance and importance that the role of "Onii-chan" provides. The anime explores the boy's evolving understanding of family dynamics and the unique bond created by the presence of a baby.