For the past few months, Mitsuki's own memories have become vague. Whenever she tries to force herself to remember, an unexplained headache occurs. Since when was it? That's right, the empty school. Since when did taking out the class trash become the class representative's job...? Even though she has to go to school on her days off, her homeroom teacher only replies via LINE. I wonder why. Whenever I try to remember something that might be the cause, my thoughts stop. This is everything that forms who I am now. Not moving forward, but stopping. This is neither comfortable nor depressing, but I can't remember the important things. I don't know who I am. That is the only thing I know clearly and vividly. And today, the trash is heavy again...