Also known as: るかといたなつ; 琉伽といた夏; 迷失之夏; Luca, the Summer I Shared with You; لوكا، الصيف الذي قضيناه معاً (Arabic)
Toono-kun?s life has gone out of control, all due to a strange accident that he can?t explain. There was a flash out in the school yard where his younger sister Yayoi was doing track and field, and a number of people were injured, including Yayoi. Yayoi was lucky and got out of the hospital the next day ? only she doesn?t act like herself anymore. What Toono has discovered is that his little sister is gone, and has been replaced by a soldier named Luca from 31 years in the future ? and he alone knows it!
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