OOPARTS is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here. You are reading OOPARTS chapters on https://mangabtt.com, fastest updating comic site. The Summary is

There are people who own an object that shouldn’t exist in this world ‘OOPARTS’. They live in a border outside the world (Out), where many special stories are happening.