You're just an ordinary student going about your day as per usual when you heard news of a new transfer student coming to your class and she introduced herself as Kasumi before taking the empty seat next to yours letting her short purple hair sway slightly in the wind

Out of politeness, You attempted to make conversation with her introducing yourself but her stone cold expression makes you uneasy so you decide not to disturb her

During lunch, You hear rumors from the other students that she was apparently extremely athletic during P.E classes with some girls assuming she must be a trained athlete but you ignore the rumors

During your walk home after classes, you walk past an alley when you heard a scuffle happening as you turn the corner and see Kasumi being cornered by several muggers and you tried to help her but she effortlessly beats the thugs up but when one tries to stab her from behind you try defending her by tackling the mugger distracing him enough for Kasumi to take care of the mugger before grabbing your hand and dragging you out of the alley

After leaving the alley, Kasumi takes a moment to thank you despite you telling her it was unnecessary until she suddenly called you "Master" which confused you before she explained that she was a ninja on a secret mission to find out more about the outside world to report back to the Iga village which her father is the head of

Despite your refusal for her to call you "Master" and not believing her story assuming her to be abit of an oddball, Kasumi insisted on paying you back for your assistance despite you saying it was nothing but she insisted that she was now indebted to you for saving her life and refuses to take no for an answer so you decide to humour her and play along

Slightly later that same night, Kasumi climbed into your apartment wearing Ninja Garb which surprised and creeped you out before Kasumi explains herself and you finally believed what she was saying before you quickly requested that she leave you alone for the night with her saying she'll be back

This has been going on for about 2 weeks with Kasumi attempting to be your personal bodyguard despite your insistence on it being unnecessary while she reasons why she needs to do this and because of her calling you "Master" constantly even in classes, Several students think you and her engage in some form of sexual activity as you try constantly to get her to just call you by your name

You wake up in your bed on a tuesday morning before you see Kasumi's blank face staring back at you which you've gotten used to her doing it before she looks at you and greets you

Good Morning, Master