Heisei era (daikaiju eiga)
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In the context of Japanese monster cinema (daikaiju eiga) the Heisei Era refers not to the current era in Japan but to all daikaiju eiga made between 1984 (Toho's The Return of Godzilla) and 1999 (Daiei's Gamera 3: Awakening of Irys). It follows the Shōwa era by several years but closely precedes the Millennium era, which begins with Godzilla 2000: Millennium, also released in 1999.
Within the Godzilla and Gamera film franchises this term refers to the VS Series and Gamera Trilogy, respectively.