YU-NO: A girl who chants love at the bound of this world

During his vacation from Sakaimachi Academy, Takuya Arima receives a package from his supposedly deceased father. It contains the mysterious Reflector Device which allows the user to travel between parallel worlds. With help from his friends, teachers, and lovers, Takuya must unearth the mystery of his father's legacy to prevent a calamity threatening to envelop reality itself.