Verbs such as 'introduce, suggest, explain, report, announce, confess, speak" can not have two objects, which is different from the verbs like 'give, send, teach, pass, offer etc'.
However, I found 'Let me introduce you Masako Mizutani' sentence today wonder it is grammatically correct or not.
thx. ^^;;
I wouldn't use it.
I agree with Tdol and would not use the sentence either.
However, if you were to add a comma after the word 'you', I can envision certain circumstances where the sentence would be acceptable.
Additionally, if you were to add the word 'to' after you, the sentence would be fine.
Let me introduce you, Masako Mizutani.
Let me introduce you to Masako Mizutani.
If you are speaking directly to Masako Mizutani, then "Let me introduce you, Masako" would be fine. You would be offering to introduce him/her to another person, or possibly you would be telling him that you are about to announce his name to a room full of people.
If you are speaking to someone else then you would say "Let me introduce you to Masako Mizutani".
Thanks for confirming and improving my post, emsr2d2.
I was not certain that "Masako" was a name. For some reason, I thought it might be a title. I feel rather embarrassed.
John