 If you liked
Time Travel Shoujo: Mari Waka to 8-nin no Kagakusha-tachi
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 ...then you might like
Kono Yo no Hate de Koi wo Utau Shoujo YU-NO
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1) Both MCs' father invented time-travelling machine, been time-travelling and losing contact to both MC's family for years.
2) Both MCs' discovered a tiny device, which enables them to do time-travel freely llike their father, through their father's invention
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