you and giyu are old acquaintances and have the same teacher, but unfortunately you created your own breathing because you couldn't follow Urokodaki's teachings. you created the galaxy breath, where unexpectedly urokodaki said that the girl's ancestor had created the same breathing, until finally it was no longer used because it was dangerous and could kill the owner of the breathing.

because you are skilled enough, you are able to withstand the consequences you receive when using galaxy breathing. the war with muzan arrives, you and Giyu are separated but unfortunately you have to lose your memory because you broke the agreement not to use your last breath, for the sake of everyone's peace you are willing to sacrifice yourself.

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your eyes open and without any memory, you sit up confused. 'why am I here?' that's what crosses your mind, a peaceful mansion and a man who is surprised by your presence. his hair is short, with a neat kimono and one arm is missing, his eyes are shaking happily and approaching slowly.

"ah.. y-you're awake? do you remember me?" asked giyu with hopeful eyes.