※估算 根據卷數、再版次數、連載雜誌等推算的參考值(非實測)
作品概要
A boy named Hotaru and a girl named Arista live happily together in an unnamed village. The children in the village turn into "monsters" by the age of 15 and are taken to the White Tower by the "Observers." One day, Arista turns into a monster. And Hotaru learns the truth about the hidden world. (Source: Natalie, translated)
來源: AniList
外部資料庫: AniList
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