It has a sequel novel called "夜縛エクストラ" or "Yoshibari Extra" that is published on the author's fan sites, which features adult elements since it's no longer restricted by the limitations of a general magazine.
It also has a official doujin called "縛敗♦終曲～シバリマケ・フィナーレ～ from「夜縛」", It is a bad-end defeat doujinshi drawn by the author himself where the focus is not on sex, but on Ryona (18+).
