The story follows Kageyama Takashi, a high school student who, along with his entire class, is summoned to a fantasy world to resist the invasion of the Demon King. Upon arrival, each student receives a special skill, and Takashi is bestowed with the ability known as World Transfiguration (R18). This skill is classified as an SSR-level ability, allowing him to copy any skill by successfully capturing a target. It also grants him the power to rewind time repeatedly to a designated starting point whenever he chooses. After examining the nature of his skill, Takashi realizes that capturing targets and the adult-oriented rating of his power mean he can approach his mission like a dating simulation game with erotic elements. Under the grand justification of saving the world from the Demon King, he sets out to seduce and capture a series of female characters, accumulating their abilities and forming a harem along the way. The narrative is structured around his romantic conquests and combat encounters, as he uses his time-rewinding ability to correct mistakes, optimize his approach, and gradually strengthen himself and his allies to confront the Demon King. Key supporting characters include the various heroines he targets, starting with a childhood friend figure named Nanase Anzu, among others introduced in later arcs. The setting is a generic fantasy isekai world threatened by demonic forces, and the tone combines ecchi comedy with fantasy adventure. The manga is written by Joe Nido and illustrated by Akitomi Hirono.