Clover Day's Plus introduces users to an interesting plot, where the essence of family and friendship ties comes to the fore. From the very beginning, the title introduces players to Yuuto, a character whose past is shrouded in complexity, who goes through all the twists and turns of life along with his support team. Clover Day's Plus is set in Japan, and Yuuto's life after his adoption is intertwined with his relationships with his two sisters, Anzu and Anri, as well as his friends Tsubame and Izumi. These characters serve as the backbone of the storyline, each bringing their own unique contributions to the story and life experiences.

At the heart of the title is the poignant theme of childhood promise, which serves as the driving force that propels the narrative forward. As gamers delve deeper into the game, they encounter the mysterious twins Hekiru and Hikaru from Yuuto's past. Their sudden appearance triggers a cascade of events, stirring long-buried emotions and revealing the enduring impact of promises made in the innocence of youth. Throughout the game, users are immersed in a fairy tale that emphasizes the importance of loyalty, friendship, and the profound influence of past commitments on shaping the present. As the story progresses, it becomes apparent that each character harbors their own intricacies, adding layers of depth and intrigue to the overall narrative.