OVA
Description
Kyousuke Irie directs the Irie Clinic in Hinamizawa and manages the village's little league baseball team, the Hinamizawa Fighters. Respected in the community for his medical work and approachable nature, he simultaneously harbors a notable fixation on maid outfits. He occasionally directs inappropriate, playful jokes about such attire towards younger girls like Satoko Houjou and Rika Furude. Despite this tendency, he demonstrates genuine concern for the villagers' well-being, particularly Satoko Houjou and her brother Satoshi Houjou.

Irie pursued neuroscience and psychosurgery after his father developed violent behavioral changes due to a traumatic brain injury sustained during construction work. Convinced this condition stemmed from organic brain damage, he dedicated himself to medicine. His research involved performing unauthorized lobotomies on patients, believing it necessary to treat mental illness, which led to his expulsion from the medical academic community. This past attracted the secret organization "Tokyo," which recruited him to study Hinamizawa Syndrome.

The Irie Clinic serves as a front for Tokyo's research. As its director, Irie collaborates with Miyo Takano and understands his role partly positions him as a potential scapegoat should operations be exposed. The clinic conducts unethical experiments, including vivisections on individuals displaying terminal symptoms of Hinamizawa Syndrome; Irie expresses reluctance about harming children. He develops an experimental treatment suppressing Satoko's symptoms. Later, after Satoshi develops terminal-stage symptoms following his aunt's murder in 1982, Irie attempts to cure him. He conceals Satoshi in the clinic's basement, fueling the village belief that Satoshi fell victim to Oyashiro's curse.

Irie provides Satoko with regular medical check-ups and financial compensation for research participation. He expresses a desire to adopt her but cannot due to being single. While his comments about her wearing maid outfits cause discomfort, his actions often reflect protective intentions, such as supporting efforts to remove her abusive uncle, Teppei Houjou. He similarly mentored Satoshi through the baseball team before Satoshi's deterioration.

In multiple story arcs, catastrophic events in Hinamizawa lead Irie to die by suicide via sleeping pill overdose, accepting blame as the clinic's director. Early conceptual plans depicted him as a more overtly villainous character, including a discarded scene where he would reveal Satoshi's preserved brain to Satoko. Internal feedback prompted revisions, resulting in Takano becoming the primary antagonist instead.