Kyōgoku can be obtained by having Yorimitsu (Lancer) reach Bond Level 10.
When equipped to Yorimitsu (Lancer) only, while that servant is on the filed, increase Quick & Buster Card effectiveness by 10% for all allies
Kyōgoku is an exclusive CE to Yorimitsu (Lancer, Summer 2017).
Rashoumon event (Ibaraki Douji event)
Murder at the Kogetsukan
Inheritance of Glory
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FGO Reroll Tier List [5/11 updated!]
Device Transfer Guide
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Best Servants [★4]: 4 Star Tier List
1-3 Star Servants Tier List
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Knight's Pride (Knight's Dignity)