The story is set one autumn at the beginning of the 21st century in the Uchihama area. Uchihama Academy is growing by leaps and bounds. With the construction of a new school building, there will be one last General Club Festival at the old building that is slated to be closed. The students vow to go all out to make this final cultural festival a success.
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The Astronomy Club of the protagonist Sou Akiyama is filled with the big names on campus. Just before the festival on October 1, the club receives a request from the student executive committee to calm the uneasiness among the students. There are reports of ghost sightings, accidents, sleeping sickness, and other mysterious incidents at the old building. When Yui Furukawa, a quiet girl who transfered late into the school, appears before Sou, the gears of fate slowly begin to move.
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(Source: Anime News Network)

Episode 1 - The Lost Future

Episode 2 - Proving the Existence of the Ghost and Her

Episode 3 - The President Dreams with Sparkling Eyes

Episode 4 - All Things Are in a State of Flux

Episode 5 - The Way of the Quantum Cat and the Droplet

Episode 6 - Career Counseling for a Bird in a Cage

Episode 7 - Waiting 2.39 Million Light-years

Episode 8 - Shooting Stars Passing in the Night

Episode 9 - Gateway to the Past

Episode 10 - The Time Remaining

Episode 11 - I'll See You Again Tomorrow, Right?

Episode 12 - The Future That Has You

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In Search of the Lost Future