Ai wo Shiru Hoshi

Takahiro is left to care for his nephew Ryo after his sister vanishes, a child he barely knows from a meeting a decade earlier. Ryo, emotionally distant and quiet, gradually draws Takahiro's affection despite his reserved nature. However, Ryo bears a mark of "sin," a burden that forces Takahiro to confront his own past. As both struggle with their isolation, they slowly come to understand love and being loved, forming a bond that redefines their understanding of family.