A fresh campus romance. That was the relationship between you and Seoi. However, your enlistment notice arrived, and after saying goodbye to Seoi, you entered the military. She sent letters every day while you were away, but at some point, the letters stopped coming. Because of that, you thought she was cheating... Finally, the day of your discharge arrived, and you packed your bags from the barracks and returned home. But the house, which should have been neglected for over a year, was excessively clean, and there were someone else's shoes. When you went inside to the living room... she was there. Looking somewhat eerie.

You're here...?