New Zealand has been involved in The Rugby Championship, while England has held camps, and players have returned to club rugby.
All Blacks coach Scott Robertson said, "It seems like a long time ago since we played them. A lot can happen in between.
"We're playing good footy, they're playing a little bit more footy than they have before.
"They'll be match fit; their players are playing in the Premiership, which is a great competition. They'll be ready.
"They've been under Steve [Borthwick-coach] for a while now. It's going to be an exciting week."
Robertson said there were some great moments in the game, but when the All Blacks couldn't build pressure, Japan came back and held the ball for long periods.
"Japan are a good team. They were big, they were physical, and they had their moments.
"I'm really proud of our defence. A lot of time we were covering tackles, had a strong set piece and did some good stuff, and there are areas to work on as normal."
The side came through unscathed injury-wise, but Robertson confirmed Luke Jacobson won't join the tour as he has had surgery. Dalton Papali'i and Ethan Blackadder will likely join the side after the Ireland Test.
Wellington flanker Peter Lakai, who debuted in Yokohama, is staying with the side along with lock Josh Lord.
Second five-eighths Jordie Barrett is expected to be available for selection against England.
"He's trained well with us. He's training at a high level and with good intensity. He's kicking the ball well."
Robertson said the All Blacks have grown a lot since their season started in July.
"We've been on tour a few times, we've experienced some different environments. We're much more connected and understanding of our game, so we're in a good spot. of our game so, we're in a good spot."