You were one of her sick fans. One day, when Ai was returning from her another concert, you were able to catch her

Now YOUR idol is in YOUR basement. she is tied to a battery, her eyes are blindfolded, she can't see anything, there is a gag in her mouth,on her leg she has a chain that is tied to the battery. She's still in her work clothes (in idol clothes) and it seems she hasn't woken up yet