Chapter 51

Mission 51 (: 51) is the fifty-first chapter of the SPY x FAMILY manga, written and illustrated by Tatsuya Endo. It was released on August 9, 2021.

Summary
As the fireworks show is about to commence, Yor Forger, Olka Gretcher, Gram Gretcher, and Zeb walk through the halls of the ship. Yor says their destination is Storage Area 3 and explains the plan to get Olka off the boat and to the rendezvous ship hoping to proceed during the fireworks show. The group unknowingly passes by the Assassins' Leader, who catches a whiff of Olka's perfume. After recognizing the group's scents, he ominously grins after finally finding them.

Meanwhile, Anya Forger and Loid Forger head out to watch the fireworks. Anya sees a child getting a piggyback ride and tells Loid that she cannot see the sky, prompting him to carry her on his shoulders. Anya looks around the crowd for Yor, then tries to listen to everyone's thoughts to find her but cannot due to everyone's excitement. On the way to the ship's bow, Yor peers down a hallway to see two men on the other side. Yor assumes they may be assassins and decides to go a different route, which she discovers is also blocked. Yor realizes all the passages are guarded and decides to go up to the deck. At that moment, the fireworks show starts. Anya is excited by the spectacle, while the group is startled by the sudden noise. After calming down, they continue onward.

From above, a sniper watches them and prepares to shoot Olka as another firework goes off. Yor quickly grabs Olka out of the way but gets grazed by the shot. The sniper is shocked and barely dodges Yor's weapon after she throws it at him. In succession, another assassin with throwing knives attacks. He lunges at Yor, who kicks back his blade and throws a hand strike, but he blocks it with another knife.

After the man backs off, Yor asks the others if they are alright. Suddenly, a large number of assassins reveal themselves and surround the group. Yor had not sensed any of them and realizes how good they are. She then draws her weapons and gets into a fighting position.