I'm inclined to agree with both posters here. To really get this tuned up will require a great deal of work (perhaps why you got the good price
So the Shinogi line is still very sloppy and the front bevel is inconsistent and the edge is inconsistently rounded off. And who knows what the back looks like.
I'd go even coarser to start off. A LOT coarser. There is a LOT of grinding ahead of you. I'd consider a 60 grit stone here OR ... and this should ONLY be attempted by someone with experience with the right equipment ... using a PROPERLY set up belt grinder.
This must be a VARIABLE speed belt grinder using a very low speed and coarse belts AND a LARGE FLAT platen - eg a 2"x8" long one or larger like the Burr King Knifemaker.
This setup allows me to recreate the proper geometry on single bevel knives in a reasonable timeframe on knives like this that need a LOT of work.
Once this geometry is properly defined you will have a good knife underneath. Since there is no Kanji on the blade to preserve, this allows a bit more freedom in repairing the shinogi line.