Shadow Star Narutaru

Synopsis

During her summer vacation at her grandparents' home, the cheerful and upbeat student Tamai Shiina encounters a strange creature. She forms a deep bond with it and names it Hoshimaru, which translates to "The Round Star." After returning to school following the break, Shiina discovers that other children have also developed connections with similar mysterious beings. However, she quickly comes to understand that not all of these creatures and their human partners are as kind as her own.