 If you liked
Rurouni Kenshin: Meiji Kenkaku Romantan
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 ...then you might like
Ansatsu Kyoushitsu
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Kenshin and Koro-sensei were destructive monsters in the past, but in present day, changed themselves to help the people around them.
However, their lives are targeted by people from their past as well as new enemies made in the present.
The supporting characters in both series learn from and are influenced by the aforementioned protagonists and have their own battles to face.
An important theme in both series is an emphasis on not killing but disabling your opponent in order to defend yourself and those important to you.