Upon enrolling in high school, Tamaki Honda joins a club for making doujin games known as the SNS Club. Joined by programmer Shiina, writer Ayame, and composer Kayo, Tamaki begins working as an illustrator for the club's next game. (Source: Wikipedia)

Kayo Fujikawa has been acting strange recently, leading her clubmates Ayame Seki and Shiina Murakami to worry about her. Moreover, her birthday is just around the corner. To lighten the mood of their precious companion, Ayame and Shiina take it upon themselves to make sure that Kayo enjoys her special day. Set before the time Tamaki Honda joins the SNS club, this extra chapter of Stella no Mahou follows the club seniors as they develop their friendship.

In the kingdom of Highland, fairies lived freely until humans betrayed them. Once a fairy has been stripped of a wing, whoever possesses it holds the fairy's life in their hands. Taking advantage of this, humans enslaved fairies, but 15-year-old Ann Halford longs to see the day when fairies and humans are treated as equals. The aspiring confectioner dreams of becoming a Silver Sugar Master just like her late mother. In order to achieve this lofty goal, Ann sets out for the capital of Lewiston, home to the annual Royal Candy Fair. However, to be bestowed the elusive title, Ann's confection crafted from silver sugar must be recognized with a royal medal at the event. Ann hires a sharp-tongued warrior fairy, Shall Fen Shall, to be her bodyguard for the perilous journey ahead. After saving him from his cruel fairy trader, she promises to return Shall's wing to him once they reach the capital, much to his confusion. But as the pair travel further along, the time they spend together grows, and they learn more about each other and their true desires.

Shiina Aki is constantly being treated like a girl due to his feminine looks so he decides to move to Tokyo to attend middle school in an attempt to change himself. However, what awaits him in his new home, Sunohara-sou, is the kind-hearted caretaker, Sunohara Ayaka. Along with the three female members of Aki's new middle school's student council, Yukimoto Yuzu, Yamanashi Sumire, and Kazami Yuri. And so begins Aki's new life in Tokyo living with four girls.