Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka: Memoria Freese - Seiya no Träumerei

The Holy Night Festival has arrived, and Bell the rest of Hestia Familia have worked hard to afford a lovely dress for their goddess to wear during the festivities, so there's only one thing left to do—celebrate! Their merriment is soon interrupted, however, by a mysterious girl from a foreign land, and it's up to Bell to help the girl evade her would-be captors! But his new friend isn't content to simply escape—she wants to enjoy the festival just like everyone else! Just who is this young lady, and why has she made the long journey to Orario...?

(Source: Yen Press)