Little Sorrow on Baker Street

"How do you prove your innocence when you wake up in a secret room with seven bodies surrounding you and all the evidence pointing to you - and you have no memory of any of it?" A 27-year-old ordinary Chinese otaku traveled through time and became Xiao Ai, trapped in a secret room on the top floor of a closed building. There are seven corpses lying in the secret room, with different ways of death and confusing clues. All physical evidence points to her being the murderer. Outside the secret room, a large number of policemen from the Metropolitan Police Department were coming up in the only elevator. She only had fifteen minutes. Her only hope is the virtual reality immersive sleeping cabin from the "Cocoon" project in the secret room - and a digital being in the cabin who calls himself "Noah".