The cute comedy manga and anime take children's stories and folktales from all around the world and asks, "what if a cat appeared in this story?"

The story moves on to a new stage──half a year has passed since the release of "POP IN 2." Thanks to Mem-cho's hard work, B-Komachi are on the verge of their big break. Aqua continues to grow as a personality, while Akane advances on her path to becoming a skilled actress. Meanwhile, Kana has lost her usual cheerfulness. Finally, in her quest to uncover the truth behind Ai and Gorou's deaths, Ruby rises through the entertainment industry—using lies as her weapon.

Every time Yoi Takiguchi so much as lets out a sigh, her female classmates squeal in admiration and awe. She has been dubbed the school's "prince" by virtue of her boyishly attractive appearance and casual disposition. However, she chooses to be indifferent toward the attention she receives and spends her days normally—that is, until the school's other prince, Kohaku Ichimura, waltzes into her life and calls her beautiful. Kohaku is nothing like a prince—he acts thoughtlessly and does as he pleases. But when he compliments her, Yoi feels flustered, and the way he looks at her gets her all nervous. He is the first boy to acknowledge her as a girl, and her attempts to distance herself prove futile as he seems to have set his sights on her. While Yoi keeps telling herself that it is nothing serious, even she cannot completely ignore the stir Kohaku causes in her heart.

In Cinnamoroll's origin story, a white dog flew down from the skies one day and was discovered by a female Cafe Cinnamon worker. The "I.Cinnamoroll" brand depicts an alternate world that poses a what-if question: What if Cinnamoroll had not met the Cafe Cinnamon worker on that fateful day? The "I" in the title stands for both the English first-person pronoun "I" and the Japanese word "ai" (love), and it represents the brand's theme of taking care of one's own body and mind.