Ōwaku first worked in the survival horror video game Silent Hill (1999) as event programmer and enemy programmer.
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This makes Ōwaku the longest-standing contributor to the Silent Hill series, behind composer Akira Yamaoka, who scored every game except for Silent Hill: Downpour.
Hiroyuki Sakai | Hiroyuki Sanada | Hiroyuki Iwatsuki | Hiroyuki Takei | Hiroyuki Iwaki | Hiroyuki Hisataka | Hiroyuki Konishi | Hiroyuki Asada | Kato Hiroyuki | Hiroyuki Wakabayashi | Hiroyuki Tamakoshi | Hiroyuki Onoue | Hiroyuki Nishimura | Hiroyuki Nakajima |