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Paradise Lost and God Speed Love are movies that serves as an alternative ending/timeline for their respective series and are both written by Toshiki Inoue. They also feature a dystopian/post-apocalyptic world.
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Both Paradise Lost and Missing Ace are movies that serves as an alternative ending for their respective shows. They are also written by Toshiki Inoue.
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Both are movies of a Heisei Kamen Rider show that follow an alternative ending to the series. They are also written by Toshiki Inoue.
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Both are alternative endings for their respective Kamen Rider shows featuring the darker tone of the early Heisei series.
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Shin and The First/The Next are retellings of the the original Kamen Rider TV show/manga, featuring a darker and more realistic setting. The protagonists were transformed into a superhuman being against their will after became a test subject of human experiments.
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Both shows have a police/detective theme where the protagonists solve cases involving crimes committed by the villains of their respective series.
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Both Kamen Rider series feature an amnesiac Rider who is 'adopted' by the family of the heroine (which has powers). There are also four main Riders.
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Both Kamen Rider Ryuki and Ex-Aid have several Riders fighting each other through competition and betrayal while facing monsters in their respective stories (Mirror Monsters / Bugsters). Both also have a secondary Rider with a knight motif.
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Both shows share a dual of protagonists (Shotaro and Philip/Eiji and Ankh) who work together to fight the monsters of their respective series (Gopants/Greeeds). The transformation gimmick of both main Riders uses different kinds of combinations which allow them to activate various forms.
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Both Kamen Rider Agito and Ryuki share similarities in the dark tone and the mystery that surround the plot of the series.