Ruka to Ita Natsu

You are reading Ruka to Ita Natsu manga, one of the most popular manga covering in Romance, Sci fi, Seinen, Slice of life genres, written by Hokazono Masaya at MangaBuddy, a top manga site to offering for read manga online free. Ruka to Ita Natsu has 27 translated chapters and translations of other chapters are in progress. Lets enjoy.
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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 What Toono has discovered is that his little sister is gone, and has been replaced by a soldier named Luca from 31 years in the future and he alone knows it!