I tried using one I bought from a 100 yen store, but it was difficult to use... I thought that the one from Nitori would be okay, so I bought it. I'd like to explain how it worked after trying it many times. ① Leave the butter you've just bought in the room for about 10 minutes. ②Peel off the silver paper from the sides and top of the butter, and place it in the case so that it covers the butter (while looking at the edge of the butter, place it so that it is the same size). ③Turn it upside down so that it doesn't move. The silver paper at the bottom is facing upwards. ④Cover with the top lid and press out the butter. ⑤Even if you press all the way to the end, the butter won't fall out, so if you run your hand over the silver paper, the butter will fall out. I only did up to ④, and recently I came up with ⑤. I hope this is helpful. It's just too simple... I wish there was a thin beige color like Deco Home.