The Last Frontier

The stage is five years after "Borderless", Nao, Kiri, and Kotone have started a new life on their own. One day, a novel written by Kiri will be published under the name of a popular young actress. Kiri is dissatisfied but cannot resist. In addition, "incidents" occur to trace the incidents in the works. They can't believe it's a coincidence, who imitated what and why? As they tried to get to the bottom of the truth, an inescapable tragedy struck them again...

In post-samurai era Japan, 1878, 292 fallen samurais are lured into a survival game where the last competitor standing claims 100 billion yen. The battleground begins at Tenryuji Temple in Kyoto, a historical hub and spiritual sanctuary, and ends in Tokyo. Only one survivor will come out of this mysterious and deadly game.

Due to a political conspiracy, an innocent man is sent to death row and his only hope is his brother, who makes it his mission to deliberately get himself sent to the same prison in order to break the both of them out, from the inside out.

Akiho Takeda is assigned to #3 investigation team for The Tokyo Metropolitan Police Department. On her first day at work, a burglary takes place at a jewelry store in Shibuya. The case though is taken by the #1 investigation team which Akiho hoped to join. Nevertheless, Akiho goes secretly to the jewelry store where the theft took place. Later, a safe at a jewelry store in Roppongi is broken into. Stolen from the safe is the diamond called "Besu". The "Besu" is one of three diamonds that makes up the "Kuraida Family's Three Sisters". The other two diamonds are "Ani" and "Kyasari". The diamond "Ani" was stolen from the jewelry store in Shibuya, that occurred a few days earlier. Several people believe the two diamond thefts were done by the same person(s), but Akiho mentions the techniques used by thieves are different. Yet, Akiho believes there must be a connection between the two cases.

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