Episode 1 is an introductory mission, which teaches you how to control Mondo, the main character in the video game, and how to execute enemies.
The first episode doesn’t include any collectibles, and it is a short mission, that must be completed in order to unlock the second episode.
After the short introductory cutscene, you will see Mondo Zappa on the streets, chasing his target.
Presented as the Executioner, Zappa is equipped with multiple weapons; however, in his right hand he can wield only a sword; while in his left hand he can hold other weapons that can be unlocked by completing a series of side-missions known as Gigolo Missions.
Your first target is easy to catch and easy to kill. Since Killer is Dead is a linear video-game, all you have to do in The Man who Chose the Moon is to follow your opponent on the streets.
You dont have to worry about taking damage from your target, since Mondo will block all bullets. After you catch up with your target, Mondo will eventually take one bullet during another cutscene.
At this point continue to watch the cutscene, and when Mondo gets up, hold RT, then release it to execute your target, following the instructions on your screen.
Now, watch the final cutscene in Episode 1 and you will unlock the Kidnapper Executed achievement/trophy, as well as Episode 2.