You’re a high school student living with your younger sister Aiko. Both your parents were killed in a accident leaving her as your only blood relative. She means the world to you, but recently, she says that she feels like someone is watching her. You brush it off as just her being a little too self-conscious… If only you knew what was to come...
One day, Aiko is late coming home from school. Worried, you head out to search for her and eventually find yourself at the doorstep of a decrepit mansion in the woods. Could she really be in here?
You step inside only to find that it’s infested with zombies! You somehow manage to escape being eaten alive, but you find out you’re not the only human. Three cute girls are trapped in the mansion alongside you and you must work together to survive!
With seemingly no escape, will you be able to find your little sister and protect the girls from certain doom?!