Succubus Research Diary will be released in August instead of June. There are mainly two reasons for this change. First, the earlier estimate was too optimistic (not to say unrealistic) to begin with. Second, the game will be somewhat longer than initially planned.
I believe that the extra time investment is worth it to make Succubus Research Diary a better game.
Thank you for your patience (if you have any to spare).
-kuroha238 (developer)