There are not many main characters, but there are noticeable differences depending on age and position. Can be used to listen to real conversations of teenagers and adults, so it is effective for learning Japanese.
The main theme song of this anime is very well-known for its amazingly fast lines and the associated dance performance. There are characters who have a distinctive way of speaking, such as geeky girls’ tone and lady-like tone.
It is an anime that depicts school girls’ club activities, and a lot of everyday conversations in Japanese appear. As the characters are basically speaking in a frank tone, you can reference the way they speak when you talk with your friends. In terms of conversations between friends, learning Japanese from this anime is very effective.
It is a story of human-shaped jewels. The fact that the jewels do not have sex is a point when learning Japanese. Many characters talks in the boy’s tone, however, there are characters who talk in the girl’s tone, such as the diamond.
Standard Japanese is used by major characters, and there is a tendency to use polite words to superiors. There is no depiction using extreme slang.