While the series was released as a TV mini-series starting in 2022, "Episode 4" or "Part 4" typically concludes the initial narrative arc or follows the progression of a specific student-instructor relationship.

You can find "Seika Jukuin Kounin: Sao Oji-san 4" on various online platforms, such as Crunchyroll, Funimation, or HIDIVE, depending on your region.

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At the helm of Seika Jogakuin is a figure of great wisdom and vision, often referred to as Kounin. This individual, with a profound understanding of educational needs and societal demands, guides the school towards innovative and effective teaching methodologies. Under Kounin's leadership, Seika Jogakuin has witnessed significant advancements in curriculum development, infrastructure, and community engagement.

The term "sao" could imply a variety of things, from a character's name in a novel or series to an acronym for a specific event or program. If "sao" refers to a character or a figure significant to Seika Jogakuin, then the fourth installment could denote a particular event, a new academic year marked by novel initiatives, or even a fourth edition of an annual event that has become a tradition at the school.

This title is part of a Japanese adult visual novel/drama CD series (from Black Lilith or a related eroge brand) focusing on a male protagonist (“竿おじさん” = “Rod Uncle”) who has official permission to have sexual relationships with students at Seika Girls’ Academy — often via hypnotic suggestion, blackmail, or institutionalized coercion.