Jupiter‘s fourth moon, Callisto—once the location of humanity’s most advanced research base. One day, “Zion Frontier,” as it was called, was struck by a mysterious explosion. One year later, the fractured remains of the base are recovered by a manned ship called “Altair.” Among the remains was a frozen capsule containing the body of genius space engineer Zion Miller, and the android Flem nestled beside the capsule. And then there was Hope, the extraterrestrial life-form discovered in the Jupiter space. A mysterious incident involving them and the crew soon occurs on-board the ship. Was this incident caused by the mysterious life-form? Or by the crew? With no means of escape, fear and suspicion spread throughout the ship… [from Gematsu]