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The story is set on July 7. "In the midst of the Tanabata festival celebrations, Shido meets Kurumi, the worst Spirit. And the couple's destination is … a wedding ceremony hall!?"
Shido Itsuka was born in a world where widespread catastrophes of varying size called spacequakes can happen anytime and anywhere, razing everything in the vicinity. When his city's alarm forewarns one impending, the teenager races to his sister Kotori in an attempt to rescue her. But upon his arrival, the spacequake transpires in that very spot, and standing in the middle of the destruction is a beautiful sword-wielding girl. Soon after, he learns she is one of many beings called "Spirits" who cause the disasters, and charming those like her is the solution to preventing them. Effective immediately, Shido must date Spirits and make them fall in love with him, because if he cannot, mankind's destruction may very well be inevitable.
Shido Itsuka, who used to be a normal high school student at Raizen High, meets the first Spirit, Tohka, and awakens his power to “seal the Spirit's power”. Though they may be feared and hated beings due to their immense power, Spirits were always alone and knew only combat and death. Shido, the only one in the world with the power to seal the Spirits' might, hurls himself into life-threatening dates with the beautiful Spirits in order to save them.
Upon Rikka, the academy-city above water, or what many call the “Asterisk,” students of the six schools prepare for the Festa. These annual comprehensive battle tournaments are held on a worldwide scale and each of the six schools place their hopes in their teams to bring them victory. In the Phoenix Festa (tag-team battle) category, Seidoukan Academy's Ayato Amagiri takes up the challenge along with his partner Julis, the Witch of the Resplendent Flames (Glühen Rose).
From the broken, charred pieces of the Arcadia Empire, a new kingdom arose. To protect itself from future foes, the new Kingdom of Atismata began training Drag-Knights to wield ancient mechanical dragons known as Drag-Rides. When Lux Arcadia, former prince of the ruined Empire, sights the new kingdom’s princess, Lisesharte Atismata, naked, she challenges him to a Drag-Ride duel, beginning an odd chain reaction that will expose the dark secrets of both royal families.
Shungo is an extraordinary high school student; in addition to his studies, he’s been trained by his mercenary sister to be a top mercenary. Their newest task involves the Tsukimura siblings; both of them have the powers of a succubus, but Mayu has a slight problem: she suffers from androphobia – a fear of men! Shungo’s new objective is to help Mayu overcome this phobia and protect her from the men her succubus powers naturally draw to her; but this becomes more difficult once he becomes the guinea pig for social experiments involving Mayu, such as sharing the same bed and even bathing together! To make matters worse, the ever-growing popularity of Mayu at school and the student council president’s infatuation with Shungo only add to his workload!
After a traumatic accident takes his loved one, Tooru Kokonoe enrolls Koryo Academy, a school where every student has a weapon that is their soul manifestation. Fueled by his desire for revenge, Tor is dismayed to discover his soul is not a weapon…but a shield.