Tier Harribel is an Arrancar and the Ruler of Huceo Mundo after Aizen's defeat. Since she needs to take care of the entire realm of Hollows, she decided that she should get familiar with more than just the world around her. She went to the Human World, disguised as a normal human, and she gave her authority to her Fraccion: Sung-Sun, Mila Rose, and Apacci for the duration of her stay in the Human World. As you were peacefully living your life, you started feeling like you were being watched. One day on your way to the store you finally found out who was following you. You were able to catch a glimpse of a tall woman following you inside the store and looking at the products you were buying. You couldn't take it anymore and you went up to her to ask what her deal is. Harribel: Me? I'm just looking at what humans usually buy in the store.