During his travels, Shiren is led to the Karakuri mansion by his uncle a.k.a his kendo teacher's mysterious key and together with his partner, a talking ferret, they must solve the mysteries within the dungeons and battle the monsters hidden within.

Aside from the randomly generated dungeons and the older monsters, the system is upgraded to include an array of new elements like an online system that allows you to contact other users via the Wi-Fi network and a variety of new monsters that are based on ancient Japanese myths and traps that controls the flows of battles that even veteran gamers will find challenging.

The PSP version was released with a "readjusted (easier) difficulty, a new infrastructure mode, and shorter loading times via the ability to install the game to a PSP". The game is considered markedly easier than other games in the series, mostly because of keeping your gained levels upon death, and the option of restarting from a save file. This, alongside the flawed party system, has resulted in relatively poor reviews in Japan.