Gift is a narrative centered on Haruhiko Amami, a high school student, and his profound bond with the enigmatic power enveloping the town of Narasakicho. The setting is defined by two unique traits: a rainbow that appears permanently fixed in the sky regardless of weather conditions, and a capability called Gift, which every resident possesses. This power can be invoked only once per lifetime and grants a single miracle. For the Gift to succeed, it must mirror the mutual feelings of both the giver and the receiver. If these feelings are not reciprocal, the Gift becomes distorted and can cause devastation in the surrounding area. In such cases, a black streak manifests in the rainbow above the town until the Gift is utilized correctly. The plot commences when Haruhiko's younger sister, Riko Fukimine, returns home after being away for several years. From the moment she arrives, Haruhiko's life begins to shift rapidly, and emotions from the past start to resurface.