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Manga by Tsuyoshi Takaki
Synopsis:In a ruined world, a human girl, Lu, and a droid, Zet, live a humble life. Then one day, they encounter a mysterious new droid, Chrome… Now all three of them live together like a family, but then…
https://mangaplus.shueisha.co.jp/titles/100057
Thers only one chapter but it seems interesting.
! Wasn't expecting Chrome to turn into a "Genos" lol