Kirei is a Japanese word that means beautiful. It can also be written as 菫 (pronounced “kirei”) or 麗 (pronounced “rei”). Kirei can appear in many different words and phrases, such as kireibyaku-iri-shuu, which literally translates to "beautiful snow," but is sometimes used to describe a sunset.
In addition to being a concept of beauty, the term kirei also refers specifically to the color blue. Another word for blue in Japanese is 亀色 (kame-iro), which translates similarly by "turquoise".
In Japanese culture, blue is considered the color of water, the sky, and summer.
Blue is the color of Kirei. It also represents Daidaira (杜鴎羅), or "the spring season". When combined with red and white, it symbolizes the rising sun.
"Kirei no hana" (literally "blue flower") appears in a number of different ways throughout Japanese culture:
"Kirei-iro no yume e" ("as if enchanted by blue") is used as a greeting instead of a customary "greetings". It's a tongue-in-cheek play on "kirei no yume e" ("enchanting dream") because one can't control their dreams and they become more bizarre as dreams progress. It's also used to say someone looks especially pretty (or handsome) today, even though it is not their birthday.
"Kirei" is a commonly used word in manga. In the anime known as Toradora, the main character, Ryūji Takasu, describes Taiga Aisaka (a character with a large forehead and panda-like eyes) as "kirei".He uses this word to describe his friend Minori Kushieda, too, describing her as "kirei-iro". In the movie Tokyo Godfathers (2003), an old man describes the baby that the three main characters are taking care of as "kirei ni aisareta" (they have been loved dearly).
Another example is when Taiga calls Ryūji "kirei" for the first time in Shinryaku! Ika Musume episode 11. It was at that moment she started to develop feelings for Ryūji. This indicates she has developed feelings for him because he was able to point her out of her shell.
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