Original Net Animation

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ONA (Original Net Animation) is an acronym used in Japan for anime titles that are directly released onto the Internet. It is a relatively new form of animation distribution that has not been widely adopted, but has been made possible by the increasing amount of Internet Streaming media websites in Japan.

The name mirrors OVA, a term that has been used in the anime industry for straight-to-video animation since the early 1980s. A growing number of trailers and preview episodes of new anime have been released as ONA.

For example, The Mastermind of Mirage Pokémon (戦慄のミラージュポケモン) can be considered as an ONA in Japan as it has only be available through the Japanese official website from October 13th to October 30th, 2006.