After their first kiss, Kaguya Shinomiya and Miyuki Shirogane are left unsure where their relationship stands. The troubling uncertainty of whether they could be considered an official couple unleashes newfound problems as both Kaguya and Shirogane struggle to sort out their feelings. While the lovestruck student council officers fret, the Christmas season rolls around, and romance is in the air. In the face of widespread tenderness, Kaguya and Shirogane must endure their affectionate battle of wits once more. Should they reconcile their feelings for one another, they may find themselves within reach of what they have both been longing for so long: true love.

After a slow but eventful summer vacation, Shuchiin Academy's second term is now starting in full force. As August transitions into September, Miyuki Shirogane's birthday looms ever closer, leaving Kaguya Shinomiya in a serious predicament as to how to celebrate it. Furthermore, the tenure of the school's 67th student council is coming to an end. Due to the council members being in different classes, the only time Kaguya and Miyuki have to be together will soon disappear, putting all of their cunning plans at risk. A long and difficult election that will decide the fate of the new student council awaits, as multiple challengers fight for the coveted title of president.

The elite members of Shuchiin Academy's student council continue their competitive day-to-day antics. Council president Miyuki Shirogane clashes daily against vice-president Kaguya Shinomiya, each fighting tooth and nail to trick the other into confessing their romantic love. Kaguya struggles within the strict confines of her wealthy, uptight family, rebelling against her cold default demeanor as she warms to Shirogane and the rest of her friends. Meanwhile, council treasurer Yuu Ishigami suffers under the weight of his hopeless crush on Tsubame Koyasu, a popular upperclassman who helps to instill a new confidence in him. Miko Iino, the newest student council member, grows closer to the rule-breaking Ishigami while striving to overcome her own authoritarian moral code. As love further blooms at Shuchiin Academy, the student council officers drag their outsider friends into increasingly comedic conflicts.

When he was a child and out catching bugs, Jin Mikuriya fatefully encountered a deity, which became the inspiration for his newest piece of art: The Tree Spirit. Trying to think of a way to bring the wooden statue to school, Jin believes that the rest of the day will be spent admiring his work. But before he can even lift it, the sculpture begins to absorb the earth around it and explodes into a cute girl! The girl, Nagi, who introduces herself as a guardian of the earth, proclaims that Jin must help her get rid of the impurities that plague the land. But alas, due to Nagi's tree being cut down and her powers completely drained, she finds herself cleansing the impurities with only a magical wand! With their lives now intertwined, Jin and Nagi find ways to learn more about one another through the endless amounts of daily antics.