How do I get a memory book [1] for tome?

[Kenpachi Zaraki]

On RMS it doesn't say anything drops it, or that it can be obtained from any boxes, so idk. could anyone tell me
1.does a monster drop it? if so, where can i find the monster & what is it?
2.do you have to make it via npc? if so, where can i find the npc & what's the name?
3.any other possible ways it's obtained.
if you don't know all of the asked to 1 of the above, i'll still take as much info u can give.
Thanks for your help.

[Bajorgas]

It only drops from WoE castles or you can buy it for a couple of ads in the item shop, buying it from the item shop isn't worth it though since it's cheaper in game. You'll just have to wait until one of the guilds holding that particular castle, I think it's pront 1, decides to vend one of the memory book[1]s.

[Kenpachi Zaraki]

okay, thanks.