Yamato Yamamoto "Seraph of the End" Illustrations: The Art of Seraph

Yamato Yamamoto "Seraph of the End" Illustrations: The Art of Seraph (山本ヤマト「終わりのセラフ」イラスト集 The Art of Seraph) is the upcoming official art book for the Seraph of the End manga series, illustrated by Yamato Yamamoto. It would be an additional art book for the Seraph of the End series.

Background
Originally, the art book was set to be released on December 4, 2017, but because of circumstances in the editorial department, it was pushed back to January 4, 2018. However, it has yet to be released.