For reference, other Warriors openings on Vita:
One Piece Pirate Warriors 2: 60,315 / 127,869
One Piece Pirate Warriors 3: 54,308 / 80,779
Dynasty Warriors Gundam Reborn: 54,667 / 121,954
Samurai Warriors 4: 39,597 / 103,614
Dynasty Warriors Next: 29,181 / 91,671
Warriors Orochi 3 Ultimate: 25,483 / 60,100
Samurai Warriors 4-II: 23,519 / 39,423
Samurai Warriors Chronicles 3: 22,152 / 33,205
Samurai Warriors 4 Empires: 13,056 / 13,056
Dynasty Warriors 8 XL: 11,870 / 40,690
I know people will say "it's Dragon Quest", but still. One Piece is One Piece, and it seriously looks like it's gonna blast every other Vita musou game out of the water.