Henry Jekyll, who succeeded in materializing as a Servant, has come into existence as a dual-existence entity who can transform even his flesh while accompanied with his persona switching over. Due to his Noble Phantasm, he can change places with "Hyde", a persona who should be beaten by himself. Fight evil with evil. While holding an unbearable dilemma, it seems he will obey his Master as well. For sure this time, he believes he will attain the justice that was never yet fulfilled by himself. However, maybe due to being summoned as an Assassin, or maybe because of the Master he lost in a previous summon, or maybe because of other reasons, his Saint Graph is unnaturally warped, and Jekyll is currently unable to completely suppress Hyde. He can barely contain and grasp a hegemonic hold over the other persona, and he has no conjecture of when he can suddenly change. Furthermore, even being summoned to Chaldea, Jekyll is struggling with the inside of himself. However, this too shall probably be settled one day. The conclusion of the conflict between good and evil is close.