Just like what a flower is to life; Hana is to Vivi.

Flowers bloom and wilt as life stands still, and that's what makes them beautiful. Vivi knows that a human's life is just a mere fragment of a demon's life so he spent his time together with Hana loving and admiring her, watching her bloom before his eyes and holding her hand when life was about to take her away. Just like how time continuously flows, all living things come to pass. It's beautiful but somewhat sad. ♡