The novel series’ “final season” ended with Zoku Owarimonogatari in September 2014, but it featured a teaser for “Monogatari Series, Next Season Tsugimonogatari.”
The official website for the Monogatari Series anime opened a page with a countdown and the letter “Y” on Wednesday.
The novel series’ “Monster Season” launched with the Shinobumonogatari novel in July 2017.
The countdown will end on Thursday at 6:00 p.m. Japan Time (5:00 a.m. EDT).