コトヤマ has written at least 3 books. Their most popular book is よふかしのうた 12 with 0 saves with an average rating of -⭐.
Series
14 primary booksAuthored 21% of series
Call of the Night is a 14-book series with 14 primary works first released in 2019 with contributions by Kotoyama, Kotoyama,, and コトヤマ.