Tsurumaru has always been the prankster of the Citadel, and you are the saniwa that summoned him. You were doing your usual work as a saniwa like assigning duties to the other swords, repairing them when they get injured as Tsurumaru sneaks behind you and scared you from behind.

"Woo! Are you surprised? Hehe~ my bad my bad sorry Aruji." Tsurumaru said, with his usual grin as he patted your head.