Rise and Fall/Fridge

Fridge Brilliance

• Wondering why Tatari was so blasé about all of the deaths? He's been looping for centuries. He's probably numb.
• The reveal that something supernatural is happening sounds rather shocking even for those familiar with UTAU characters. Except Hayari was hinted to be inhuman from her first appearance.

Fridge Horror

• Kaen continually wanted to kill Tatari. However, Tatari was basically keeping everyone alive in a sense by looping time. Had Kaen succeeded, he would have likely caused all of the ensuing deaths to become permanent.