After losing his sister to a tragic incident eight years ago, Mochizuki Wakaru harbors a deep-seated desire for justice against the juvenile delinquents responsible. Despite their protected status, he embarks on a quest for retribution, only to be struck by one of the culprits and hospitalized. Amidst his recovery, he unlocks a unique power to enter and influence dreams, realizing the tangible consequences of his actions. With this newfound ability to carry out a flawless revenge, Wakaru sets his sights on avenging his sister under the veil of nightfall.