What's up e/ chapter 13? The pages are all half grey. Edit: https://comick.io/comic/saikyou-no-maou-ni-kitaerareta-yuusha-isekai-kikanshatati-no-gakuen-de-musou-suru/ail1A7uV-chapter-13-en Link for chapter 13 on a different site.
Saikyou no Maou ni Kitaerareta Yuusha Isekai Kikanshatati no Gakuen de Musou Suru