def is_hiragana(word):
    """Checks is the word is a Japanese hiragana.

  This is using the unicode codepoint range for hiragana.
  https://en.wikipedia.org/wiki/Hiragana_(Unicode_block)

  Args:
    word (str): A word.

  Returns:
    bool: True if the word is a hiragana.
  """
    return len(word) == 1 and 12353 <= ord(word) <= 12447
