The fourth OVA season is titled Strike The Blood IV (Strike The Blood Fourth).
The Strike The Blood Kieta Seisō-hen OVA will ship on January 29, 2020, and the first installment of the Strike The Blood IV OVA will debut on March 25, 2020.
The “Dengeki Bunko Aki no Namahōsō Festival” event on Sunday revealed that the Strike The Blood franchise is getting both an original video anime (OVA) episode and a fourth OVA series in 2020.
Strike The Blood III, the third Strike The Blood OVA season, shipped in five installments between December 2018 and September 25.