Where can I read Op manga in form of pdf or something?
You'd have to torrent it for that, most likely. It's usually uploaded online as images.
If you want to download it and save it in your pc you can screen shot the pages and edit the app section on the corners but it will take long time... at least it is a way you know😎☠
Download the app manga rock and you could read any manga and download them to read anytime anywhere
Or he may download the app as apk in your computer from Google store
Listen to Fanlyoko.
What do you think?