I've been on a manga reading spree recently, having completed good manga like Helck (2014; Nanao Nanaki), Thermae Romae (2008; Yamazaki Mari) [and its IMO better ongoing spinoff Olympia Kyklos] or Boku dake ga Inai Machi (2012; Sanbe Kei)
Does anyone have some recommendations for something that's...
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Plot-driven (Romance is fine, as long as it's not one of those stories that moves at a snail's pace)
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At worst mildly horny
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Doesn't have awful politics
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Isn't half the length of One Piece
and of course
- good?
It's not a super tight allegory, but the invaders are basically refugees and are treated similarly (perceived as a huge threat when they're just desperate for safety)