This is China Eastern, reasonably short layovers. Price is available on Booking.com however on airline website it shows 3000+ euro. Booking class I which gives from 125% to 295% depending on your status and loyalty program.
I just found this one fare, and it doesn't always show. Considering that official site shows double price I assume it won't be available for too long. Shangai Airlines operates leg between Tokyo and Shanghai.

I do not see if this includes a lounge however Google flights says "Individual suites" for the seat type, for both legs (short one is just three hours so not sure what they provide).
Long flights is 14 hours, and the cabin looks neat so I guess it should be good. I mean, I don't know if these are correct cabins but that is what I found for the aircraft type.
Big luggage included: 1x personal item, 2x cabin luggage, 2 checked bags max 32kg.




I expect for SF to burn this one in under two hours so be fast.

https://www.google.com/travel/flight...sas=1&curr=EUR