Boku ni shika Mienai Kimi

First-year high school student Yuma Kazaoka has been troubled since childhood by his constitution, which "attracts beings that are not of this world." One day, Yuma meets a boy on the rooftop who asks him to "cooperate with me in exchange for protecting him from evil spirits"—? Yuma accepts the offer, and as a sign of their contract, he and the boy are bound together by a "red thread"..! (Translated from mynavi.jp)