"NIGHTHEAD" (sixth sense)... that refers to the 70% of the brain capacity that humans don't use. It is said that the incredible "power" that humans possess is hidden in the 70% part. The elder brother Naoto Kirihara and the younger brother Naoya Kirihara are so-called superpowers. Naoto Kirihara's ability is "telekinesis", while Naoya Kirihara's ability is "mind reading" and "precognition". Naoto loves his younger brother Naoya very much and thinks about his brothers very much. He is a competent brother. The two were taken from home to the institute when they were young and raised for 15 years. Because the old man Misaki set up a barrier in the institute to protect them, the two have never been able to go to the outside world. After the old man Misaki died, the barrier disappeared, and Naoto took Naoya out of the institute. The two began their lives in the outside world, but the superpowers they possessed would attract the "negative energy" full of the outside world. Various events happened to the two. The mysterious girl, Shoko Futami, who appeared as if guiding these two people. What is change. And then who is "Misaki"...