In the animation, when the hero and heroine go out to attend the temple fair, they can all see the petite figure of apple candy on the heroine's sandy jade hand. Sour and sweet is like the taste of love, which is somewhat suggestive.
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Apple candy:
At temple fairs, celebrations or fireworks in Japan. There will be a dessert "candy apple", which is called apple candy in Chinese, with rose frosting and small Japanese apples.
The glittering and lovely appearance of red is very popular with girls and is a classic on festivals. It was originally called candy apple, a snack with a stick wrapped in sugar sherbet. This is a traditional food in Britain. Since ancient times, it has been used to entertain guests in the autumn harvest season, and it is indispensable in Halloween and fireworks night in the west.
During the Meiji Restoration, it spread to Japan and often appeared in Japanese comics, so it was often mistaken for Japanese food and called "apple candy" among Japanese fans.