 If you liked
Rosario to Vampire: Season II
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 ...then you might like
The Breaker: New Waves
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These two titles have many things in common , Both have MC who's trying to be stronger and fighting so much , till becoming one of the strongest characters in the story.
Both are manga that continues where prequel left off and also more serious.
One of the biggest differences is that Rosario+Vampire arouses around youkai world while The Breaker is martial arts , so you can expect many epic battles and plot-twists.