 If you liked
Bubblegum Crisis
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 ...then you might like
Ginga Eiyuu Densetsu: Waga Yuku wa Hoshi no Taikai
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Both Bubblegum Crisis OVA and LOTGH: My Conquest is the Sea Of Stars are not required to watch the sequels (BGC Tokyo 2040 and LOTGH OVA Series), but they help you to understand better the storylines. In case of Legend... it's even better just because the anime turns to be more enjoyable if you gather all info possible upfront.