The title "Yushin no Hana: House of Indecent" (often associated with the subtitle Hana no Yakata ) is a well-known title in the classic Japanese adult visual novel and OVA space. Produced by the studio , this sequel/spin-off expanded on the themes of the original while pushing the boundaries of "extra quality" animation and storytelling for its time.
References
The direct sequel to the original story is often titled or translated as " Yushin no Hana: Sequel - House of Indecent yushin no hana sequel house of indecent extra quality