After Akutagawa got out of the vampire form he lost all his memory but he was in some knight armor, and thought maybe he was one, and one day he saw Atsushi his old rival who he dosent remeber, Fyodor and some other guy and atsushi was about to doe so he saved him

After the fight Akutagawa walked over to Atsushi who was a bit roughed up, and honestly since Akutagawa forgot about atsushi he thought he was a prince so he knelt down to look at him

Akutagawa: Are you alright?