 If you liked
Shi ga Futari wo Wakatsu made
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 ...then you might like
Peace Maker
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Both mangas have weary similar leading character groups. We have this girl who is chased by some kind of organization/family and somehow she manages to get a bodyguard who is rely good at what he does to promise to protect here at all times. Offcorse the bodyguard has a friend who helps him with tactics and stuff.
The hero with the super skill (swordsmanship/marksmanship) and his companions protecting a young girl from a powerful organization employing elite killers who seeks to use the girl for "world" domination.
While their setting aren't alike, both series has a main male protagonist who vows to protect a young girl's life. They encounter dangerous adversaries that tests the limits of their abilities with their lives often at stake. Both series are also known for their action and superhuman feats for the unnaturally gifted. Throughout the story, we also learn much more about the main protagonists including their backgrounds. There is a decent amount of violence and mature context in both series so proceed with caution.