Famitsu has Etrian MD topping the chart with 72k:
http://www.famitsu.com/biz/ranking/
Also nice debut for the new Prince of Tennis: 23,272; FuRyu must be happy.
{28/02/2002} Prince of Tennis [PS] - 58,790 / 133,407
{25/04/2002} Prince of Tennis: Genius Boys Academy [GBA] - 101,925 / 231,947
{26/09/2002} Prince of Tennis: Sweat & Tears [PS] - 46,646 / 72,796
{12/12/2002} Prince of Tennis: Aim at the Victory! [GBA] - 42,150 / 96,133
{20/02/2003} Prince of Tennis 2003: Cool Blue / Passion Red [GBA] - 82,856 / 172,134
{24/07/2003} Prince of Tennis: Smash Hit! [PS2] - 50,304 / 94,491
{25/09/2003} Prince of Tennis: Sweat & Tears 2 [PS2] - 21,049 / 41,129
{30/10/2003} Prince of Tennis: Kiss of Prince - Ice / Flame [PS2] - 17,413 / 22,178
{18/12/2003} Prince of Tennis: Smash Hit! 2 [PS2] - 34,928 / 79,694
{12/02/2004} Prince of Tennis: Love of Prince - Sweet / Bitter [PS2] - 12,987 / 17,473
{18/03/2004} Prince of Tennis 2004: Glorious Gold / Stylish Silver [GBA] - 50,193 / 95,156
{16/09/2004} Prince of Tennis: Form the Strongest Team! [PS2] - 30,565 / 53,650
{09/12/2004} Prince of Tennis: Rush & Dream [PS2] - 17,190 / 24,481
{30/12/2004} Prince of Tennis 2005: Crystal Drive [DS] - _ / 51,658
{22/12/2005} Prince of Tennis: Prince of School Festival [PS2] - 17,597 / _
{25/01/2007} Prince of Tennis: Doki-Doki Survival [PS2] - 14,604 / 24,680
{20/12/2007} Prince of Tennis: Driving Smash! Side Genius [DS] - _ / 21,578
{24/01/2008} Prince of Tennis: Driving Smash! Side King [DS] - 11,978 / 25,505
{05/03/2009} Prince of Tennis: Prince of Doubles - Girls, Be Gracious! [DS] - 13,290 / _
{26/03/2009} Prince of Tennis: Prince of Doubles - Boys, Be Glorious! [DS] - 5,900 / _
{11/02/2010} Prince of Tennis: Prince of School Festival - More Sweet Edition [DS] - 45,454 / 54,180
{05/03/2015} The Prince of Tennis II: Go to the Top [3DS] - 23,272 / 23,272
I don't think this holds water considering how Of The End (Dead Souls) was a fucking zombie spin off, and yet it sold on the same level as the other mainline Yakuza games in the end. Clearly there was a lot of love for the modern cast and setting. 0 should do well if the love is still there, if it's not, then that's a sign of decline.
Dead Souls sold really well, and better than Kenzan, but only slighty better than Ishin (417k vs. 385k) and anyway worsers than 2 (572k... 800k with the budget version), 3 (509k), 4 (557k) and 5 (583k). Also, it seems Dead Souls didn't receive a budget version, while the others did.