Enterbrain are reporting that the PSP Go — which released a month after its U.S. / European launch in Japan — has sold 28,275 units in its first day on the market.
For comparison, here are some other portable hardware figures from Enterbrain:
DS Lite: 117,556 (first two days)
DSi: 170, 779 (first two days)
PSP-3000: 141, 270 (first four days)
While the tracking periods in all four cases aren’t of the same length, new releases tend to perform best on their first day. The data suggests the PSP Go isn’t making a particularly big splash in Japan at the moment.