Synopsis
Tamai Shiina spent her summer vacation with a small, round star named Hoshimaru. After returning to school, she discovers that other children possess similar living companions from beyond their world. This hidden community of paired humans and creatures seems peaceful at first, but the bond between them is not always harmonious. As Shiina learns more about these entities, she realizes that some creatures and their partners harbor much darker intentions than Hoshimaru.
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