Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.
Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
The movie also hints at a larger story since Jinnai was brought to that era by space aliens.
Source: https://www.cbr.com/adv-famous-anime-trailers-from-vhs-era/