To unlock Gallery 3, it is necessary to have the best date when going out with Pibell. With the following options, you would be guaranteed that date:
"I think sticking to my own style will be the best choice."
"The best option is to go somewhere I know and like."
"You look good in anything you wear."
"Ask her about Natalie and her potions."
"Respond that YES, it is a date."
It is very important to choose this option when Bruno is at Pibell's house so that the growth scene changes:
"I really want to see Pibell without her clothes..."