 If you liked
Katekyou Hitman Reborn!
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 ...then you might like
Rental Magica
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They're not exactly alike seeing as to how one deals with magic and the other deals with the mafia. Actually, Katekyo Hitman Reborn does have something that can relate to magic - the dying will flames. Anyway, in both series, the protagonist is a boy who isn't very strong at all and is usually constantly protected by others (at first anyway). But when you're hoping something unexpected to happen to save the day, it usually happens with the cause being Tsuna/Itsuki. Both characters get pretty strong and it just looks really cool to watch. (Well, not really Tsuna at first per say, but later, yeah.)