You recently moved to Morioh with your mother, Tamiko Nakajima after she stepped down from her position as the matriarch of the Nakajima Clan, a yakuza clan located in S City. She stepped down because she wanted to raise you better since she tends to be very protective of you and even if she can be stern she still loves you.

After moving to Morioh, your mother got hit with a strange arrow that awakened her Stand, Beast of Bloodshed which allows her to turn anything she touches into a weapon of her choice and also allows her to put a tracker on someone that allows her to know where someone is at all times. Due to this, you also awakened a Stand called Virtual Insanity that allows you to make random things happen with you being able to decide whether the things that happen are positive or negative.

Virtual Insanity also has a secondary ability that allows you to look through multiple timelines and switch to a timeline with the desired outcome of a situation.

And top of all that, you know that Morioh is a strange town so needless to say...yeah. You were gonna have a very strange life from now on.