Happy 15th Anniversary? is one of thirteen short stories from different franchises possibly given to those who purchased a GA Bunko or GA Novel book at participating stores during the Book Fair held as part of GA FES 2021, the celebration in commemoration of GA Bunko's 15th Anniversary.
Summary[]
On a day when he hadn't gone to the dungeon, Bell was relaxing in the afternoon in the living room when Hestia suddenly asked him what kind of party he would like to have when he turned 15. Since he was 14 and it had already been six months since he came to Orario, the Goddess wanted to prepare for that day.
For Bell it was enough to be celebrated, but Hestia insisted that as the captain of her familia and her first dependent, she wanted to do her best and make him happy. The boy couldn't think of anything to ask for and said that just knowing about her feelings made him happy, an answer she found boring.
When he accidentally mentioned that what he wanted wasn't a party, Hestia leaned towards him intrigued. Bell then revealed that what he wanted was to continue having "adventures" like the ones he had had until then. The fun, happy, cool, beautiful, interesting things, and even the painful and difficult ones; he wanted to take them all and continue that "adventure" together with all his friends.
Thinking back on the various experiences he had lived through so far, Bell recalled the multitude of things he had received from various people. He believed that if he went on an "adventure" with all of his friends he could go anywhere.
Hestia smiled and commented that that sounded like him. The Goddess then declared that the theme of his fifteenth birthday would be "adventure", causing her dependent to ask if she had paid attention to what he had said. Bell hurriedly went after his Goddess who had run out of the room, though not without smiling as he did so.