Crisis Core: Final Fantasy VII was released in Japan last week and sold 487,000 copies in the seven-day period.
It was a bumper week for software sales in the territory, with two new Pokemon titles taking second and third spots yielding a top three sales figure of over 1 million units sold.
Elsewhere Mario Party 8 was the sole Wii entrant in seventh, with Wii Sports and Wii Play both dropping out of the top ten last week.
The full sales top ten is as follows:
1. Crisis Core: Final Fantasy VII (PSP)
2. Pokemon Fushigi no Dungeon: Toki no Tankentai (DS)
3. Pokemon Fushigi no Dungeon: Yami no Tankentai (DS)
4. Fate/Tiger Colosseum (PSP)
5. Another Century's Episode 3: The Final (PS2)
6. Taiko no Tatsujin DS (DS)
7. Mario Party 8 (Wii)
8. Final Fantasy: Crystal Chronicles - Ring of Fates (DS)
9. Sengoku Musou 2 Mushouden (PS2)
10. My Housekeeping Diary (DS)