Tamaki, the spirited younger sister of the protagonist, channels an infectious energy often offset by her distractible nature. Her anticipation for inheriting her brother’s bicycle sours when he damages it, sparking frustration over his carelessness. This distrust deepens as she confronts him about suspected lies surrounding his exam results, straining their bond. During a fateful shrine visit, her brother’s rash bargain with supernatural forces leads to her transformation into a radiant artifact, swiftly consumed by the enigmatic Yoyogi. This act propels her brother into a desperate race to undo his mistake, with Tamaki’s plight anchoring his journey toward accountability and growth. Her existence—both as a sibling and a catalyst—drives his evolution, intertwining her fate with his redemption.