Hetalia: The Beautiful World

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Hetalia" Season 4.
Constraints:
Use ONLY provided SYNOPSIS and SOURCES.
No invented/guessed titles, names, dates, counts, awards, ratings, box-office, viewership, or plot points.
If detail is missing, omit it.
Write original, neutral, encyclopedic prose.
No markdown, no asterisks, no headings, no bullet points in the text content.
Output valid JSON only.
JSON Keys:
overview: 160-220 word summary of the season's narrative arc.
primer: Array of exactly 4 concise bullet points summarizing essential previous lore, character positions, and stakes.
TMDB Synopsis: "The adorable boys of Hetalia are back with some new friends and a super sparkly new look."
Source [1]: Overview: "Forget what you learned in history class, and imagine all the nations of the world as guys on an inappropriate reality..."
Source [2]: "Hetalia: Axis Powers: With Daisuke Namikawa, Todd Haberkorn, Patrick Seitz, Eric Vale. An anime in which personified countries show history in a humorous fashion."
Source [3]: Stream on Crunchyroll.
Source [4]: User review (not useful for facts about Season 4).
Source [5]: Streaming info.
Season 4 Narrative Arc: The provided synopsis for Season 4 (implied by the prompt's context of the TMDB synopsis) says: "The adorable boys of Hetalia are back with some new friends and a super sparkly new look."
Problem: The synopsis is extremely short (21 words). The requirement for the overview is 160-220 words.
Constraint Check: "You write ONLY verifiable facts that are explicitly supported by the provided SYNOPSIS and SOURCES... If a detail is not in the provided material, you omit it rather than guess."
Conflict: I cannot write a 160-220 word summary if the source only provides 21 words and I am forbidden from inventing details.
Resolution: I must attempt to expand using only the provided facts. However, there are no other facts about Season 4 specifically in the sources. The sources discuss the series in general (personified countries, humorous history, etc.).
Wait: Let me re-read. The prompt asks for Season 4. The TMDB synopsis