Thirty years ago, the Eurasian continent was devastated by a supermassive "spatial quake"—a phenomenon involving space vibrations of unknown origin—resulting in the deaths of over 150 million people. Since then, these quakes have been plaguing the world intermittently, albeit on a lighter scale. Shidou Itsuka is a seemingly average high school student who lives with his younger sister, Kotori. When an imminent spatial quake threatens the safety of Tengu City, he rushes to save her, only to be caught in the resulting eruption. He discovers a mysterious girl at its source, who is revealed to be a "Spirit," an otherworldly entity whose appearance triggers a spatial quake. Soon after, he becomes embroiled in a skirmish between the girl and the Anti-Spirit Team, a ruthless strike force with the goal of annihilating Spirits. However, there is a third party that believes in saving the spirits: "Ratatoskr," which surprisingly is commanded by Shidou's little sister! Kotori forcibly recruits Shidou after the clash, presenting to him an alternative method of dealing with the danger posed by the Spirits—make them fall in love with him. Now, the fate of the world rests on his dating prowess, as he seeks out Spirits in order to charm them.

The Ayanoi High School features the Geijutsuka Art Design Class (GA) that focuses on the arts. Five close friends — the energetic "hime"-prankster Noda Miki; the level-headed, cynical Nozaki Namiko; the intelligent, observant, and kind Oomichi Miyabi; the lively and mischievous tomboy Tomokane; and the curious, innocent, glasses-wearing Yamaguchi Kisaragi — attend this class with great enthusiasm, learning about the many art techniques. Every day seems to pose a new and interesting challenge, be it struggling with the latest assignment or when dealing with the daily strangeness of school life. (Source: AniDB)

GA: Geijutsuka Art Design Class OVA. "I Want to Draw the Blue Sky"

The franchise is celebrating its 20th anniversary with this new project. Note: The recap episodes are not included in the main episode count and are now included here.