The PS3-exclusive Studio Ghibli and Level-5 collaboration--which scored a 9.0 in its GameSpot review--saw many retailers running out of stock over the weekend. Thirty-two percent of the game's total sales came from the £74.99 RRP Wizard's Edition.
Hitman HD Trilogy, the other new release this week, came in at fifth.
FIFA 13 sticks in second, with Far Cry 3 dropping one position to fourth. The rest of the top 10 is filled out with Assassin's Creed III, Need for Speed: Most Wanted, Just Dance 4, Hitman: Absolution, and The Elder Scrolls V: Skyrim.
Capcom and Ninja Theory's DmC: Devil May Cry slips out of the top 10 into 11th place after three weeks on the chart, with Skyrim outselling it by less than 50 copies.
This week sees the release of Dead Space 3 and Scribblenauts Unlimited, but will either be able to take the charts crown from Ni no Kuni next week?
The Top 20 UK charts for the week ending February 2:
1. Ni no Kuni: Wrath of the White Witch
2. FIFA 13
3. Call of Duty: Black Ops II
4. Far Cry 3
5. Hitman HD Trilogy
6. Assassin's Creed III
7. Need for Speed: Most Wanted
8. Just Dance 4
9. Hitman: Absolution
10. The Elder Scrolls V: Skyrim
11. DmC: Devil May Cry
12. Football Manager 2013
13. Halo 4
14. Forza Horizon
15. Skylanders Giants
16. Lego Batman 2: DC Super Heroes
17. Lego The Lord of the Rings
18. Sonic & All-Stars Racing: Transformed
19. WWE '13
20. Sleeping Dogs