Hottest game in Japan? According to Amazon, it's SNK's witch toucher Doki Doki Majo Shinpan. The game was previously known as Doki Doki Majo Saiban ("Throbbing Witch Trial"). A quick summary: Search for witches lurking in a junior high school. When the search is narrowed down, the suspected junior high school witch is examined with the touch pen. Usually, there's a "witch's crest" hidden somewhere on her body which can appear in "Witch Check Mode."
The DS game isn't out until July, but it's already topping Amazon Japan's "Best Seller" list. It's more popular than Final Fantasy Tactics and The Legend of Zelda: Phantom Hourglass. No, really! Over on the Doki Majo blog, the game's producer writes that he can't believe this has happened and gives out a big thank you. This crazy little game could be SNK's biggest hit in like forever.