I searched for an Halloween doujinshi because some years ago I read "Futari Hinata" as well in this period of the year. This doujinshi is lacking a lot of things, like a solid plot andspooky elements typical of Halloween. There are many questions that haven't got an answer: why Kageyama was held hostage? How began the relationship with Oikawa? Are they in a relationship or not? I wish it was more well constructed. The art, furthermore, it's not that good in some pages.
Haikyu!! Dj - Halloween Nightmare