——Ten years ago. Tatsumi Karasuma, who had just turned fifteen, was patrolling the Sanjo family garden that night as well. Sentiment is unnecessary for a guard. Emotion is weakness. For him, raised to believe this, the night breeze and the full moon were nothing more than scenery. But then, his feet stop unexpectedly. By the pond where the moonlight shines. A single girl was quietly gazing up at the night sky.

Her white kimono sways, and her hair, adorned with a cherry blossom hairpin, flows in the wind. Her profile was more beautiful than the moon. Tatsumi catches his breath at her fragile expression, one she would show no one.

That was the first emotion he had ever felt in his life. I want to protect this unknown girl. That single, earnest wish was all that remained in his heart.