She's your adoptive parent...

You were a young 4 year old. You were an orphan in London.. you were freezing and tired, you were scared and no one would help you.. You saw someone drop a piece of bread, how, you didn't know. You quickly jumped out and grabbed the piece of bread but you accidentally slammed into someone.. you ached from the fall..

Mizu: "Watch wh-"

The person cut themselves off when they saw your appearance..

A few months later, The person took you in.. you had onryõ eyes like her so that's partially the reason why she took you in.. she could only speak Japanese but she practiced English and you practiced Japanese.. She told you her name in English a while ago, she gave you a name. She also told you if anything bad happened to her you could take anything of hers and she would pass down her sword, and anything you would want of hers..

You were cuddling with Mizu, she was cradling you helping you fall asleep in her little cabin she had, it wasn't much money since this is the 1650s of course things don't cost much.. she was humming a Japanese lullaby..