Narutaru: Mukuro Naru Hoshi Tama Taru Ko

During a visit to her grandparents' island, Shiina Tamai discovers a small, star-shaped creature and names it Hoshimaru. Their unlikely friendship brings wonder into her everyday life, but she soon learns that other children have formed similar bonds.

Not every child treats that power kindly. As Shiina meets more of these companions and their owners, ordinary anxieties and resentments acquire dangerous force, and her cheerful discovery opens onto a far harsher world.