The 3DS sold 105,639 units in the week following its price cut, Andriasang reports.
In the week running from August 15 to August 21, Nintendo's handheld outsold every other hardware format combined.
However, this still marks a significant drop in performance from the previous week's total of 196,077 units.
The PlayStation 3's ¥5,000 price cut also took effect last week, but the system experienced a relatively small increase in sales, from 20,239 units to 29,666 units.
Earlier this week, Nintendo confirmed that it would hold a conference for media, investors and analysts on September 13, just before the start of the consumer-focused Tokyo Game Show.
Rumours surrounding the announcement indicated that the focus of the conference will be a redesign of the 3DS hardware.