The central tragedy of this episode is the demise of Kurusu. Throughout the series, Fourth was positioned as a moral anchor—a detective and ally. However, Episode 12 reveals the depths of his desperation:
: When Kurusu takes Yuno hostage, Yuki’s diary predicts he will accidentally shoot her if he fires. Defying destiny, he proclaims his love for Yuno and pulls the trigger, managing to hit Kurusu instead. Mirai Nikki Episode 12
This episode marks a controversial shift in Yuki's character. For the first time, he drops his "whiny" persona—albeit briefly—to actively protect Yuno. The central tragedy of this episode is the demise of Kurusu
For a deeper breakdown of the survival game mechanics and how they lead to these high-stakes confrontations, check out this retrospective: check out this retrospective: