The only memories Hisui has of her childhood are of her training with Nichirinkai.
A normal, carefree childhood was something she never knew.

To her, however, Nichirinkai was like family.
Her training mates who endured grueling times alongside her, her dependable seniors who lit her path, and her juniors who followed her with innocent admiration…
Even if it wasn’t something she could be particularly proud of, it was still a precious home she never wanted to leave.

And then the day came when betrayal found its way to her doorstep.
After all, what they did was unethical, operating in the shadows, skirting the edges of legality.
Darkness in the heart breeds distrust and distrust leads to mistakes.
It just so happened that the betrayer was someone she was incredibly close to.

At first, Hisui was filled with rage over the betrayal.
She vowed to make the runaway pay for turning her back on Nichirinkai.
But that anger didn’t last. Before long, bittersweet questions took over her thoughts:
Why did she leave without saying a word?

Now, Hisui continues her journey, determined to find the traitor.
But when that moment comes, what will she feel?
And what will she say?

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