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World winners New Zealand stretched out following the underdogs, but just to a in depth winning margin over Reduce Namibia had stored them up using a brave display.
With 35 minutes Namibia were in one among the three-time winners.
But the All Blacks have been in clinical disposition from the second half, ending with 11 tries.
Pool B will be topped by new Zealand whenever they conquer Italy next weekend.
That would set up a quarter-final against the runners-up of Pool A, that is boiling down to some three-way conflict between Ireland Japan and Scotland.
Hopes of a New Zealand rout were perplexed as Namibia, the lowest-ranked side from the championship, showed no sign of being awed by the prospect of taking over the world number one aspect.
As striking scrum-half Damian Stevens acquired a penalty to the joy of Welsh coach Phil Davies, the underdogs scored the first points of the match.
As well as a fast line along with a decision to become involved with the breakdown, Namibia showed some hands and incisive lines to create incursions in the All Black defence.
Hooker Torsten van Jaarsveld led the way for Namibia as they remained close before replacement prop Angus Taavao along with full-back Ben Smith went just before the break to give New Zealand a comfortable 15-point cushion at the break.
New Zealand coach Steve Hansen, that gave Brodie Retallick his projected 30-minute outing on his very first appearance since suffering a shoulder injury in July, seemed to wind up his side for the next half.
Prop Joe Moody moved inside 2 minutes of the resume, the first of seven tries as New Zealand pared their game down to principles.
TJ Perenara spared the rating for last as he and offloads were exchanged by replacement Brad Weber – Webers becoming a pass – diving to the corner to scatter down. A packed Tokyo Stadium stood to pay tribute after an entertaining encounter.
New Zealand coach Steve Hansen:The first half was fairly disappointing. We didnt develop with the ideal mindset and Namibia made that is paid for by us. Its a good lesson?
Second half, there was pretty great things in it. I was really delighted with Jordie Barrett at 10, (he) played really, very nicely.
To be the third-choice first-five (fly-half), and also our two superstar first-fives not enjoying… He got us around the back well. We ended up scoring (eleven) tries so theres a lot to enjoy about doing it.
It didnt occur in the first half because we had a bad attitude. Theyd more intention than us and played better than us in the first half.
Namibia coach Phil Davies:Were just pleased that what we spoke about before the game we were really doing on the field against the best team on earth. So we are really delighted.
The scoreboards not very pretty at the conclusion but the energy and the dedication… so proud of the players together with how we attempted to perform and certain things that we actually did, which will be pleasing.
New Zealand: Smith Goodhue Bridge; J Barrett Moody Laulala, Retallick, Whitelock Cane, Savea.
Replacements: Coles Taavao Todd, Weber, Perenara, Ioane.
Van Lill, namibia: Tromp, Klim, Newman Greyling; Kisting, Stevens; Rademeyer, Van Jaarsveld, De Klerk Gaoseb Venter.
Replacements: Nortje, Theron Retief Jantjies La Harpe, Du Toit
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