Transit visa 144 hours

Yes, your itinerary is definitely eligible for 144 hour visa free transit valid for wider Shanghai area.

The main thing you should take care of is the segment Japan - Shanghai. You should be aware that you are not allowed to have any mainland Chinese port docking immediately before Shanghai. In other words, you cannot have a docking of this kind:

Japan - Tianjin - Shanghai

However, you can have something like this:

Japan - Tianjin - South Korea - Shanghai.

It is always important that your mainland Chinese stop has both of its immediate stops, before and after, in two different countries or eligible territories (eligible territories are Hong Kong, Taiwan and Macau).

So, if all the requirements I have mentioned are satisfied, you are free to go and enjoy your stay in Shanghai absolutely visa free. Have a nice trip.