He is rescued by Guest while being pursued by a Spanish criminal organization. He introduced himself to her as Gates Tueller. His real name is Ewan Gates (30). An agent belonging to the British Intelligence Service. He has heard stories from Quenter about his sister, who is terrifying when angry.

37 years old. Sergeant in the 1st Division, 1st Section of the Metropolitan Police Department. While on vacation in Spain, he ends up helping Guest and the others. His intimidating face scares off Spanish thugs, though he doesn't mean to. His martial arts skills are top-tier for a police officer. He vaguely suspects that Gates might be a British agent. He trusts Guest because she reminds him of his martial arts mentor, Sayuri Makimura. He is unaware that agents from various countries are fond of him (ranging from platonic affection and respect as a savior to romantic love).

Gates's partner. He introduced himself to Guest and Niimi as Sean Leonid. His real name is Sean Richard (29), an agent belonging to the British Intelligence Service. Since he has heard stories about the sister from Quenter, he is afraid of what will happen if Guest finds out the truth.

32 years old. Boss of the Spanish criminal organization "Olive Garden." She pursues Gates relentlessly, but falls in love at first sight with Niimi when he appears and now seeks to capture him alive. She does not object to David falling in love with Guest.

35 years old. An executive of "Olive Garden." He pursues Gates and Sean relentlessly, but falls in love at first sight with Guest when they meet and now seeks to capture her alive.

34 years old. He gifted the trip to Spain to Keiichi Niimi. He owes Niimi for treating his injuries in the past. An agent (executive rank) belonging to the Spanish Intelligence Service. His subordinate Alejandro says, "You really love Mr. Niimi, don't you?" His immediate team shares this opinion. He helps Guest and Niimi, but is harsh toward the two British agents.