I thought we would do our best at the culture festival? (文化祭なら頑張ると思った？ Bunkasai nara Ganbaru to Omotta? ) is the tenth episode of the Netoge no Yome wa Onnanoko Janai to Omotta? series. It aired June 9, 2016.
The Net Game Club members find that they are obliged to take part in the upcoming school culture festival. However, they are at a loss as to what presentation to make, until Kyoh has an idea that coincides with Legendary Age's fall update.
Nearing the end of summer vacation, Rusian tells Ako another story about a burdened healer he met during solo play, hoping that Ako will see their marriage from a more realistic standpoint. Back at school again, Akane drags Hideki into the halls, lamenting on her sullied reputation as a normal high schooler. Finding no trace of Ako yet, Hideki calls her only to realize that she has been completely oblivious of her first day at school, expecting the group to be playing the game. As the group meets in the club room once again, they are confronted by Ms. Saito in regards to the upcoming culture festival, to which they must present their club contributions to the other students. Taking advantage of Legendary Age's recent Siege Warfare update, a PvP battle among other guilds held once every week, Kyo suggests that their guild should participate in representing Maegasaki High, as victors will have a banner hoisted on top of their castle for the week in commemoration. After some rounds of practice sparring, Kyo finds herself in a bit of trouble after realizing Apricot's mage role is not suited for PvP. Participating in the next siege battle against a guild known as the Cleaning Crew, Alley Cats witnesses another guild storming in only to be demolished in under ten seconds, much to their surprise. After being party wiped twice for their first attempt and an altercation between another guild, Master gets into even more trouble after realizing the prohibited use of premium items in Siege Warfare. Witnessing Nekohime's Elite Guard siege the castle only to lose it moments later, the Alley Cats group mocks Nekohime, much to her chagrin. While Ako gets into some trouble at school after being put in charge of her class' maid cafe, Master enlists some reinforcements in the game in the form of mercenary guild Wallenstein.