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At the end of World War II, Japan was split and a great tower was erected that reached the skies. For three friends, Hiroki, Takuya, and Sayuri, memories of their summer spent together would stay with them forever. During that precious time, the three promised to one day travel to the tower in the skies on the wings of a white plane -- to finally see its brilliance and the surrounding land of Ezo -- but when Sayuri suddenly disappeared from their lives, the promise that once was made was broken. Though time continues to pass, will the three ever meet again some day?
In Kyoto in the year 2027, Naomi Katagaki, a male high school student encounters a person who claiming to be Naomi from 10 years in the future. Together, they must change the future and save a classmate, Ruri, whom the younger Naomi starts to date in three months.
As the school term draws to a close, Koutarou Makimura vows to confess his love to Kaho Serizawa, the most beautiful girl in school. However, on the way home, he accidentally fondles a time traveler named Ligene, causing her to strike him recklessly over the head with an hourglass. When Koutarou wakes up, he discovers that summer has been and gone and that Kaho has tragically died. Now, with Ligene's help, he must leap through time and change the events of summer in order to save Kaho from her fate.
When transfer student Ryoichi Kyogoku appears things take a turn for the weird. Students are missing school, the student council bans cellphones, and Kyogoku begins changing students by awakening their psychic abilities to prevent a future disaster on Earth. Kenji Seki and his friends get caught in the middle and must try to figure out what is going on in time to save their friends and the future.
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.