Furuhonya, an old bookseller, is back from his travels, and he's found a magic book! The book takes a liking to Yushi, who quickly finds himself even more of a part of this strange world than he ever expected.
which should have only become known 
to Europe in the 15th century,
الذي يُفترض أنّه لم يُعرف في أوروبا
إلّا في القرن الخامس عشر
desconocidos en Europa
hasta el siglo XV,
desconocidos en Europa
hasta el siglo XV,
que só passaram a ser conhecidos
 na Europa no século 15,
которые появились в Европе 
лишь в пятнадцатом веке,