This craft essence is currently unavailable on the EN ver.Seaside Luxury is can be purchased from Dead Heat Summer Race! event shop.
Here is a list of servants & CEs that can be obtained for the duration of the Summer 2017 event part 1: Dead Heat Summer Race and part 2: Death Jail Summer Escape.
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
5 Star Servants Tier List: Best Servants [5/9 updated!]
FGO Reroll Tier List [5/11 updated!]
Best Servants [★4]: 4 Star Tier List
Demon (Demonic) Servants & Enemies
1-3 Star Servants Tier List
Caster of Okeanos (Circe)
Assassin of Agartha (Wu Zetian)
We'll Conquer the Ocean of Stars
Talk on the Heated Sands
Fox's Night Dream
Piece of Year 2030 (A Fragment of 2030)