Duel Masters: Duel Masters VSRF

Season overview

Role: Meticulous television and film archivist.
Task: Produce a JSON object for "Duel Masters" Season 12.
Constraints: Use ONLY provided synopsis and sources. No invented facts. No markdown. No asterisks. No headings. No bullet points (except in the array for the primer). 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.
Synopsis:
Sequel to Duel Masters VSR.
Continues events after the battle between the Invaders and Revolutionary.
Last season and conclusion of the Versus Saga.
Katta Kirifuda had a 'V' mark on his forehead that hides a mysterious force (power was sealed).
Removing the seal has little impact, but Hamukatsu starts to talk.
More hamsters like Hamukatsu appear.
A secret organization called "Rare Killers" exists; members are transfer students at the school.
Mystery of hamsters and the identity of the Rare Killers.
Final battle is starting.
Sources:
[1] & [2]: Mention Shobu Kirifuda, a mysterious organization interested in his ability to bring Duel Master creatures to life, and his goal to be like his father/become a Kaijudo master.
[3]: General franchise info.
Goal: 160-220 words.
Drafting:
Duel Masters Season 12 serves as the final season and the conclusion of the Versus Saga in the anime. This season acts as a sequel to Duel Masters VSR, picking up the chain of events following the battle between the Invaders and the Revolutionary. A central element of the narrative involves Katta Kirifuda, whose forehead once bore a V mark that concealed a mysterious force. Although this power was sealed, the process of removing the seal leads to unexpected developments, such as Hamukatsu beginning to talk. As more hamsters similar to Hamukatsu appear, new mysteries emerge regarding their nature. Simultaneously, a secret organization known as the Rare Killers becomes a focal point of the story. The members of this organization are revealed to be transfer students at the school. The season explores the mystery surrounding these hamsters and the true identity of the Rare Killers as the final battle approaches. This concluding chapter brings the long-running saga to its end, focusing on the escalating conflict and the secrets held by both the mysterious creatures and the new students