Instructions
Play through the game until you have reached Termina in Another World. This is the area immediately after the battle with Solt and Peppor in Fossil Valley. When you exit Fossil Valley, head to the large port city to the west on the World Map.
Watch the scene between Glenn and the flower lady, then go up the stairs. If you do not have Kid in your party, she will be waiting for you here. Once you have her in your party, she talks about infiltrating Viper Manor, which will require a guide.
Chase Kid up the stairs if you have Leena in your party. Kid will leave the area where you meet her the first time if you have Leena with you. If this happens, go straight up the second set of stairs and speak with Kid again to recruit her.
Go back down the stairs toward the main entrance to Termina, where the bar is located. Go into the bar and head all the way to the left, where you will find a man in white with long, lavender hair. Speak with him to discover that his name is Guile and that he intends on breaking into the manor.
Ask Guile to be your guide when prompted to do so and he will automatically join your party.