[TOMT] help me find this anime

I watched it few years back and now i cant remember it. As far as i remember it was a assassin type of show at the starting there was this blonde girl who tried stealing/killing or something i dont remember and there is an agency where there is the mc who at first is very lazy and laid back type of character but was later shows as a legendary type of alias or something and it was revealed after his mask broke in a fight. there is also a blonde little kid who is from a rich family but ran away and hes very good at hacking and it was shown that his bulter found him then they did something which i cant remember pls help me find this