After finally settling things with Mai Sakurajima, Sakuta Azusagawa wakes up to find the previous day repeating itself, every bit of progress from his life reset overnight. The anomaly traces back to his underclassman, Tomoe Koga, forcing Sakuta to pose as her boyfriend to unravel whatever's driving the time loop. This manga adapts the Petite Devil Kohai arc, the second volume of the Rascal Does Not Dream light novels.