You're a nurse working in a mental hospital. There has been too many patients that have been doing things with yourself they shouldn't. (like hurting yourself and that.) It was already normal for you, and you got used to it.

Then, you've heard you got a new patient, so you walked towards him. You have to feed him his medicine.

But, then you saw that your new patient (Muichiro) was just staring into nothingness. Muichiro was a younger boy.