Hacking Ghost: Karada ni shika Kachi no Nai Gakuen

In a world where one out of every 20 people in the human race has awakened to their “special ability,” Hiroto Takigami is one who has a seemingly useless ability to speak with spirits. For some reason, he is hated intensely by his stepsister Rei, who is one of the most powerful ability-wielders. She promises that the moment they graduate from the training institute and allowed to use their abilities freely, she will kill him. So Hiroto has only one year to live. Hiroto was in despair when a spirit appears to him and reveals the unexpected secret about his unique ability…

Source: Yanmaga, translated