Hi gang - I'm flying ANA for the first time in my life (thankfully, on J), in a few weeks (I'm Gold on Cathay's Marco Polo and a freq flier thru HKIA, but "unfortunately" have to fly ANA for a coming work trip

).
Qs: On Dec 13, I've got a 45m window between my LAX-NRT/NH 815 and NRT-KUL/MH 1138 flight. What degree of confidence would I have in making my connection?
I see both flights land/depart in NRT's T1, so that's great. Any wise, frequent ANA/NRT travelers here can weigh in?