According to Dengeki official website, the final series of Nogizaka Haruka no Himitsu was announced to be a four-volume OVA series. The title is "Nogizaka Haruka no Himitsu Finale♪".
Source: Dengeki Bunko
Previous topic: Third Season of Nogizaka Haruka no Himitsu Announced (Jul 2011)
Source: Dengeki Bunko
Previous topic: Third Season of Nogizaka Haruka no Himitsu Announced (Jul 2011)
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Anime