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When an episode begins, it shows us a short clip that is about a minute explaining the "idea of the show" and the story.
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An opening is a theme song that sets the tone and how the series feel to the watcher. For anime, an opening is usually in Japanese or sometimes in English. It can be a mix of both. The opening is about a minute or 2.
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The reminder is a clip that takes a short part of the episode. It's a little near 15 secondes. It shows a resume of the last episode.
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The plot is the episode's story line; it is what's going in the episode and what we are watching.
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The ending is basically like the opening, but it's in the end of an episode, and it closes it. The ending is a theme song that can take about 2 minutes or plus.