Here's a short story:

Kanji, or "kan'ji", are the adopted logographic Chinese characters that are used in the modern Japanese writing system along with hiragana and katakana. The Japanese term "kanji" for the Chinese characters literally means "Han characters" and is written using the same characters as the Chinese word '. 

Chinese characters first came to Japan on official seals, letters, swords, coins, mirrors, and other decorative items imported from China. The earliest known instance of such an import was the King of Na gold seal given by Emperor Guangwu of Han to a Yamato emissary in 57 AD. Chinese coins from the first century AD have been found in Yayoi-period archaeological sites. However, the Japanese of that era probably had no comprehension of the script, and would remain illiterate until the fifth century AD. According to the "Nihon Shoki" and "Kojiki", a semi-legendary scholar called Wani () was dispatched to Japan by the Kingdom of Baekje during the reign of Emperor Ōjin in the early fifth century, bringing with him knowledge of Confucianism and Chinese characters. 

The earliest Japanese documents were probably written by bilingual Chinese or Korean officials employed at the Yamato court. For example, the diplomatic correspondence from King Bu of Wa to Emperor Shun of Liu Song in 478 has been praised for its skillful use of allusion. Later, groups of people called "fuhito" were organized under the monarch to read and write Classical Chinese. During the reign of Empress Suiko (593–628), the Yamato court began sending full-scale diplomatic missions to China, which resulted in a large increase in Chinese literacy at the Japanese court. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: How many types of characters are mentioned?
Guess: Han character

Question: What are they a part of?
Guess: the modern Japanese writing

Question: What country are Kanji actually from?
Guess: China

Question: When were they first seen in Japan?
Guess: 57 AD

Now answer the following question in the same format.

Question: How did they arrive?

on official seals and letters