01./00. [WII] Dragon Quest X: Mezameshi Itsutsu no Shuzoku Online # (Square Enix) {2012.08.02} (¥6.980) – 367.148 / NEW
02./01. [3DS] New Super Mario Bros. 2 (Nintendo) {2012.07.28} (¥4.800) – 213.547 / 621.050 (-48%)
03./04. [NDS] Pokemon Black 2 / White 2 (Pokemon Co.) {2012.06.23} (¥4.800) – 66.758 / 2.521.764 (-9%)
04./07. [3DS] Tohoku Daigaku Karei Igaku Kenkyuusho – Kawashima Ryuuta Kyouju Kanshuu – Mono Sugoku Nou o Kitaeru 5-Funkan no Oni Training (Nintendo) {2012.07.28} (¥3.800) – 31.792 / 72.064 (-21%)
05./06. [WII] Just Dance Wii 2 (Nintendo) {2012.07.26} (¥5.800) – 29.602 / 89.723 (-51%)
06./09. [WII] Kirby’s Dream Collection: Special Edition (Nintendo) {2012.07.19} (¥3.800) – 21.001 / 150.655 (-28%)
07./02. [PS3] Persona 4: Arena (Atlus) {2012.07.26} (¥7.329) – 20.477 / 148.961 (-84%)
08./00. [NDS] All Kamen Rider: Rider Generation 2 (Bandai Namco Games) {2012.08.02} (¥5.230) – 20.459 / NEW
09./08. [PSP] Digimon World Re:Digitize (Bandai Namco Games) {2012.07.19} (¥5.230) – 17.508 / 134.362 (-44%)
10./22. [WII] Wii Sports Resort with Wii Remote Plus # (Nintendo) {2010.11.11} (¥5.800) – 15.706 / 1.012.372
11./13. [3DS] Kobitodzukan: Kobito Kansatsu Set (Nippon Columbia) {2012.07.26} (¥5.040) – 14.653 / 35.278 (-29%)
12./14. [3DS] Taiko no Tatsujin: Chibi Dragon to Fushigi na Orb (Bandai Namco Games) {2012.07.12} (¥5.040) – 14.321 / 131.794 (-29%)
13./05. [PSP] Super Dangan-Ronpa 2: Sayonara Zetsubou Gakuen # (Spike Chunsoft) {2012.07.26} (¥6.279) – 13.646 / 82.646 (-80%)
14./00. [PSP] All Kamen Rider: Rider Generation 2 (Bandai Namco Games) {2012.08.02} (¥6.280) – 12.928 / NEW
15./11. [3DS] Rune Factory 4: A Fantasy Harvest Moon (Marvelous Entertainment) {2012.07.19} (¥5.229) – 11.467 / 118.439 (-45%)
16./12. [PS3] Jikkyou Powerful Pro Baseball 2012 (Konami) {2012.07.19} (¥6.980) – 11.292 / 94.980 (-46%)
17./16. [3DS] Dragon Quest Monsters: Terry’s Wonderland 3D # (Square Enix) {2012.05.31} (¥5.490) – 11.056 / 848.725 (-11%)
18./03. [PSP] Nayuta no Kiseki # (Nihon Falcom) {2012.07.26} (¥6.090) – 10.998 / 85.858 (-85%)
19./00. [3DS] Smile PreCure! Let’s Go! Marchen World (Bandai Namco Games) {2012.08.02} (¥5.040) – 8.786 / NEW
20./20. [WII] Mario Party 9 (Nintendo) {2012.04.26} (¥5.800) – 8.718 / 510.638 (-9%)

Dragon Quest X does top the charts, but this is one of the lowest debuts for a Dragon Quest game in quite some time. The last entry, DQIX, sold well over two million units in its first week. The same goes for Dragon Quest VIII.

Source