Welcome to Demon School! Iruma-kun: Season 4

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Welcome to Demon School! Iruma-kun" Season 4.
Keys required: overview (160-220 words), primer (array of exactly 4 concise bullet points).
Constraints: Use ONLY provided synopsis and sources. No invented titles, names, dates, etc. No markdown, no asterisks, no headings, no bullet points in the text (though primer is an array). Output valid JSON only.
Content constraints: overview must be 160-220 words. primer must be 4 concise points.
TMDB Synopsis: Iruma and the Misfit Class face the Music Festival challenge. All thirteen students must reach Rank 4. There is a mysterious classmate who cannot afford to stand out and must keep his identity hidden. Iruma encounters new demons and challenges. Events include the Music Festival, its aftermath, the Dinner of the Thirteen Crowns, and the Dem-Dol Games. Iruma's friendships, ambitions, and reputation grow.
Source [1]: Series title, rating (TV-14), genres (Animation, Comedy, Sci-Fi & Fantasy).
Source [2]: Creator (Nishi Osamu), voice actors (Ayumu Murase, Hozumi Gôda, Ayaka Asai, Ryohei Kimura). Plot: 14-year-old Iruma's parents sell him to a powerful demon, he is adopted and sent to a demon high school.
Source [3]: Iruma Suzuki is 14. Sold by irresponsible parents. Lives with demon grandfather who is the principal of a school in the Netherworld.
Source [4]: Manga by Osamu Nishi.
Source [5]: Release date/info (Dec 22, 2019).
Goal: 160-220 words.
Drafting:
In the fourth season of Welcome to Demon School! Iruma-kun, Iruma Suzuki and the Misfit Class encounter their most significant challenge to date as they prepare for the upcoming Music Festival. For the group to succeed, all thirteen students must achieve Rank 4. This mission is complicated by the presence of a mysterious classmate who must remain inconspicuous to keep his identity hidden from others. As Iruma continues his life within the Netherworld, he faces unexpected challenges and meets new demons, all of which push him closer to the center of demon society. The narrative arc follows the group through the Music Festival and its