Bonus Feature:
Go to the Extra Vision menu and select the Character Data option, then hit left or right once to reveal an animation detailing a different way Kazuki could have been found.

Bonus Animation:
From 'Extra Visions', go to "Character Data". Go to the page for Rara Mitsuki and highlight "Extras". Press your Up button then your Enter button for an animation of Mitsuki meets Mitsuki