The Hoshiguma Dish is a dish owned by the oni Yuugi. It improves the rank―that is, the taste―of sake poured into it, making it perfect for liquor-loving oni. The moment any sake is poured in, it turns into the highest-grade sake with a smoothness and balance that cannot be described, but the sake's taste deteriorates with time.
You have to drink the sake from the dish quickly before the taste deteriorates, but it is a fairly big dish. Only a kannushi (wait, who?), an oni or a tengu could drink it all at once.
When Yuugi and Suika are invited to anything, liquor shops find it hard to do business. When Yuugi's Hoshiguma Dish is combined with Suika's Ibuki Gourd, which can create an infinite amount of sake, you can have all the delicious sake you want.
If you are sick or injured, you should use Kasen's Ibaraki Box of a Hundred Medicines instead of the Hoshiguma Dish. Drinking sake out of Kasen's box cures sicknesses and injuries. Apparently, it even fills you up with monstrous power, but the price is that it also gives you the personality of an oni...
If you make friends with Yuugi and end up drinking together, you will have the chance to drink the best sake you have ever tasted, but you should be careful―oni can drink far more than any normal human can. It should still be a fun night out though... At least until you have to face the world's worst hangover the next day.