 If you liked
Rosario to Vampire: Season II
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 ...then you might like
To LOVE-Ru Darkness
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Both manga are sequels. They are both vast improvements from and darker than their predecessors, building more complex stories around their changing characters. The characters show great amounts of development as each series progresses. They are both published in Jump SQ. Rosario+Vampire is more serious while Darkness follows a more comedic pattern.