FMC have printed flower pattern on her hair. That is not a hair deco in the mundane sense. Very unique trope. I hope it became a trend in future anime girls.
Okay, as per my last chapter's observation, I thought this story would involves time travel plot, seeing near last chapter FMC vows not to let MC died, as if she knew what will happened to him. That, plus her unusual hair color and new style of hair deco in a historical samurai story setting, made me conclude this story have a time travel element.
Glad I am wrong. Time travel as a plot point generally suck ass.