Sister Breeder Episode 4 is the fourth installment in the hentai OVA series (OVA シスターブリーダー ＃4), released on February 27, 2026 (censored version primarily, with some sites claiming uncensored leaks or exclusives). Unlike the previous episodes that continued the core “Sister Breeder” incest storyline with step-siblings Shouta (Shota), Rena (Reina), and Aina, Episode 4 shifts to adapt a different doujinshi/manga by Takeda Hiromitsu titled something like “Akuma de Kanojo wa Boku no Tenshi” (Devilish Girlfriend is My Angel) or a similar forbidden teacher-student theme.