I bought one of the manuscript/map about Heironimius/Elgar that triggered the Wolf School Gear treasure Hunt quest..

During the quest, I uncovered books and/or letters that triggered Upgrade Quest part 4 and 6, which are Level 29 and 34 respectively. I tried visiting several merchant and armorers and smithies, but none of them are selling any manuscript regarding Wolf School Upgrades.

How do I trigger the Part 2,3, and 5?

This is BTW my 3rd playthrough. On the 1st one, I completed The Cat School Gear. the 2nd one, The Griffin School gear. On both all the basics and upgrades were triggered by purchasing map from the Armorers/Smithies.

Never mind, I finished just finished "Swords and Dumplings". Hatori have in his stock the manuscript that triggered "Part 1 and 5 Upgrade". Probably somewhere in Part 1 will trigger Part 2 and 3.