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Summary
Official Details
Toono-kun's life has taken a drastic turn following a mysterious accident in the school yard where his younger sister Yayoi was participating in track and field. The incident, marked by a sudden flash, resulted in multiple injuries, including Yayoi's. Although she was fortunate enough to be discharged from the hospital the next day, her behavior is no longer recognizable as her own. Toono has made the astonishing discovery that his sister has been replaced by a soldier named Luca from 31 years into the future, a secret known only to him.
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