Sub-Singularity III: Shimousa-no-Kuni Castle Town free quest is the best place to farm Kotan Magatama.
Sub-Singularity III: Shimousa-no-Kuni Toke Castle free quest is the place you can farm Kotan Magatama and Bizarre Godly Wine.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
Sasaki Kojirou
Best Craft Essence: Craft Essence Tier List
Evil Bone
Device Transfer Guide
Ereshkigal
Arthur Pendragon(Prototype)
Gorgon
Black Holy Grail (The Black Grail)