MEDIA CREATE SALES
[PSV] Tokyo Xanadu (Falcom, 09/30/15) – 88,879 (New)
[PS3] Pro Evolution Soccer 2016 (Konami, 10/01/15) – 48,473 (New)
[PS4] Pro Evolution Soccer 2016 (Konami, 10/01/15) – 39,017 (New)
[PS4] Yoru no Nai Kuni (Gust, 10/01/15) – 35,907 (New)
[PSV] Yoru no Nai Kuni (Gust, 10/01/15) – 32,904 (New)
[3DS] Yo-kai Watch Busters: Red Cat Team / White Dog Squad (Nintendo, 07/11/15) – 32,676 (1,599,416)
[3DS] Picross 3D 2 (Nintendo, 10/01/15) – 30,468 (New)
[Wii U] Super Mario Maker (Nintendo, 09/10/15) – 30,150 (275,332)
[3DS] Pokemon Super Mystery Dungeon (Nintendo, 09/17/15) – 19,355 (215,733)
[Wii U] Splatoon (Nintendo, 05/28/15) – 14,958 (696,454)
[PS4] Mad Max (Warner Bros., 10/01/15) – 14,458 (New)
[3DS] Animal Crossing: Happy Home Designer (Nintendo, 07/30/15) – 14,347 (1,065,020)
[PS4] Metal Gear Solid V: The Phantom Pain (Konami, 09/02/15) – 13,938 (386,171)
[PS3] Yoru no Nai Kuni (Gust, 10/01/15) – 10,416 (New)
[PSV] Tokyo Ghoul: Jail (Bandai Namco, 10/01/15) – 10,390 (New)
[PS3] Arslan: The Warriors of Legend (Koei Tecmo, 10/01/15) – 10,337 (New)
[PS4] Arslan: The Warriors of Legend (Koei Tecmo, 10/01/15) – 10,034 (New)
[3DS] Dragon Quest VIII: Journey of the Cursed King (Square Enix, 08/27/15) – 8,921 (785,585)
[PSV] Minecraft: PlayStation Vita Edition (SCE, 03/19/15) – 8,164 (351,598)
[PS3] Metal Gear Solid V: The Phantom Pain (Konami, 09/02/15) – 6,998 (174,689)
Yoru no Nai Kuni sold almost 80,000 units combined (PS4, PS3, PSV) in the first week. To compare it with others gust games, Atelier Escha & Logy sold 57,550 the first week and Shallie 43,744. Atelier Meruru was the best sold Atelier (in the PS3 era) with 82,585 units sold.
Considering this was a totally new IP, I think it was a big success.