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The aforementioned Ai scored a “Wonder Egg” from a gachapon machine at a deserted arcade. But when Ai falls asleep and a girl (!) emerges from her Wonder Egg, the worlds of dreams and reality begin to collide. And it’s all connected.
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Jintan, Menma, Anaru, Yukiatsu, Tsuruko, and Poppo - six grade-school students who were the best of friends. As the "Super Peace Busters," they always played together at their "secret base" until Menma died in a tragic accident. Five years later, Menma appeared before Jintan, now a high school freshman.
No one could see her but Jintan, and Menma told him that she wanted the Super Peace Busters to grant her a certain wish. But not even Menma herself remembered what that wish was. Having been traumatized by Menma's death, the five had drifted apart, but after giving vent to their bottled-up feelings in an emotionally-charged moment, they gradually went back to being the "gang" of years past. And then Menma said goodbye, leaving letters to everyone of the Super Peace Busters.
One year later - once again, they gather at their secret base, each of them with a letter to Menma in hand.