FANBOXにてラフや高画質版イラスト、その他同人誌読み放題等の特典を公開しています。
https://kaedeko.fanbox.cc/

On my FANBOX you can find rough drafts and high-resolution versions, along with being able to read other doujinshi, right now specially open to the public.
https://kaedeko.fanbox.cc/