What's the anime? One of the settings is to put peas under the pillow so that the real princess can't sleep.

The story "Princess and Pea" in Andersen's fairy tales. Once upon a time there was a prince who wanted to marry a princess, but she must be a real princess. He traveled all over the world trying to find such a princess. But no matter where he goes, there will always be some obstacles. There are many princesses, but he can't tell whether they are real princesses. They always have problems. As a result, he had to go home and was very unhappy because he was so eager to get a real princess. One night, there was a terrible storm. The sky is blacked out, thundering and raining heavily. This is really scary! At this moment, someone knocked at the door and the old king answered it. Standing outside the city is a beautiful girl who calls herself a princess. Oh, my God! That girl is as beautiful as a fairy! "Yes, we can check it right away." The old queen thought about it, but said nothing. She went into the bedroom, took all the bedding and put a pea on the bed. So she took out twenty mattresses and pressed them on Doudou. Then, she put twenty duvets on these cushions. The girl who calls herself a princess sleeps on these things at night. Everyone asked her how she slept last night in the morning. The girl said happily, "It's so comfortable! That bed is simply made of sponge, so soft! Oh! How soundly I slept yesterday! " The prince immediately said to the girl, "Please leave, because you are not a real princess." The next night, there was another terrible storm. The sky is blacked out, thundering and raining heavily. This is really scary! At this moment, someone knocked at the door and the old king answered it. Standing outside the city is a princess. But, my God! How ugly she looks after the wind and rain! Water ran down her hair and clothes, into the tip of her shoes and out of her heels. She said she was a real princess. "Yes, we can check it right away." The old queen thought about it, but said nothing. She went into the bedroom, took all the bedding and put a pea on the bed. So she took out twenty mattresses and pressed them on Doudou. Then, she put twenty duvets on these cushions. The princess sleeps on these things at night. Everyone asked her how she slept last night in the morning. "Oh, it's hard!" The princess said, "I almost didn't sleep a wink all night!" " Who knows what's in my bed? I slept on a hard thing, which made me blue all over. This is really scary! "Now everyone can see it. She is a real princess, because she can still feel a pea under these twenty mattresses and twenty duvet beds. No one can have such delicate skin except a real princess. So the prince chose her as his wife, because now he knows that he has got a real princess. People will call him princess and pea. This pea was therefore sent to the museum.