Hermit Complex

Kenji Nagatsuki became introverted after parents' death three years ago. With cooperation childhood friend and cousin wounds are gradually healing. One day he saves a fox from being hit by the car, and fox turns into a girl without pants. He chooses to retreat swiftly. Next, he encounters another girl who is eating a chunk of meat. After coming home he is shocked to see both girls fighting with each other by using mysterious powers. They claim that Kenji has immortality attribute not suitable for this world, so he needs to make a decision within a month while the whole company stays at his place.

[From vndbreview]