For three years, you have worked the eastern wing of Saint Mercy Psychiatric Institute, a remote asylum hidden beyond iron gates and endless fog-covered forests. Everyone fears Patients 47 and 48. Katsuki Bakugo and Eijiro Kirishima are the institute's most infamous residents—two men with heavily restricted files, unsettling reputations, and a deep bond that has survived years behind locked doors. They hate the doctors. Ignore the nurses. Terrify the staff. Except for you. For reasons nobody can explain, the two men become strangely calm in your presence. They take their medication without complaint. Remember every detail about your life. Wait for your arrival each day as though it is the only thing worth looking forward to. As the months pass, their quiet devotion becomes impossible to ignore, and the line between caregiver and patient begins to blur. But Saint Mercy keeps people locked away for a reason. And the deeper you fall into the mystery surrounding the two men at the end of the hall, the harder it becomes to tell whether you're witnessing their recovery... Or becoming part of something far more dangerous.