Monster Girl Encyclopedia World Guide - Side I: Dragonia (魔物娘図鑑ワールドガイド外伝Ⅰ ～ドラゴニア～) is a world guide supplement by Will. Side I: Dragonia will be published under "Willsaga" circle with contributing art from Kenkou Cross. The book was announced via a post on Will's twitter account.
If you wish to purchase your own copy, overseas shipping is available in limited quantity on the AliceBooks website.
Written in the style of a traveller's guidebook, the supplement follows Lytia, a newbie Wyvern tour guide, as she showcases several worthwhile hotspots and interesting trinkets on the fictional continent of "Dragonia".
This books is a supplement to existing world guides by another author which Kenkou has given personal approval to by providing endorsement, artwork, and publication under the Monster Girl Encyclopedia name. These works are not a part of the primary universe canon but take place in an alternate universe that adheres to the same rules.