This craft essence is currently unavailable on the EN ver.Dive to Blue is can be purchased from Death Jail Summer Escape event shop.
For the duration of "Death Jail Summer Escape" event, this craft essence gains the following effects:
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!]
Best Servants [★4]: 4 Star Tier List
1-3 Star Servants Tier List
Ramesses II (Ozymandias)
FGO Reroll Tier List [5/11 updated!]
Best Craft Essence: Craft Essence Tier List
Holy Night Supper
Victor from the Moon
Moon Goddess' Bath