Written by Kinoko Nasu.
Serva★Fes, the Luluhawa Summer Festival Singularity where Servants get together to enjoy Summer and produce doujinshi, has returned. The last time this innocuous event happened, it came with a sinister ulterior motive, and there is only one Servant who has the skillset for something this ridiculous — looks like BB is at it again!
...Except not. While BB did recreate the Luluhawa Singularity, she had (shockingly) meant to keep it benign this time, but something or someone has hijacked and altered it to their own ends. Hoping to lay low while the Ordeal Call happens in the background, BB has no choice but to beg the Protagonist for help. Assembling a Summer-themed crack team of Altria Caster, Suzuka Gozen, Chloe von Einzbern, Gawain, Tristan, and Lancelot (Saber), the Protagonist Rayshifts their group into the Singularity... and is immediately met with the titanic visage of a flaming Cernunnos, followed by Luluhawa's — now "Hawaiitria" — timeloop-enforcing mechanic: a city-wiping Excaliblast.
When the timeloop resolves, Suzuka and the three knights have been scattered somewhere in the Singularity. Now several heads short, the Protagonist, Altria Caster, and Chloe are the only ones able to enforce the rules of the Singularity:
- Doujin circles are forbidden to fight each other (non-artists can still fight each other all they want).
- Strict adherence to the Committee's decided genre.
- Evil BB Money from the previous Serva★Fes is not allowed.
- No one is allowed to work past the night curfew.
- No one is allowed to stay in Hawairthuria unless they're participating in the Serva★Fes, be it as an artist, customer, or staff.
- Large gatherings such as barbeques, outdoor concerts, or game tournaments require a permit.
If one of these rules is broken, or Serva★Fes is otherwise interrupted, the timeloop resets. And all the while, the trio has to find their missing teammates, fight off three "Calamities" a la Faerie Britain aiming to derail the event, navigate the massive amount of changes the Singularity has undergone, and take down the culprit behind the whole fiasco meddling with Chaldea's Summer.
...This is going to be a hot mess.
Tropes featured in this episode:
- Aborted Arc: It was previously hinted in Imaginary Scramble that the second Servant Fes would have featured Yang Guifei vs BB due to their natural incompatibility and patron Outer Gods' mutual hostility towards each other. Due to the Ordeal Call, BB has been Demoted to Extra, Yang Guifei is nowhere to be seen, and the focus is primarily on Servants from Faerie Britain and those associated with them.
- Not Me This Time: If it weren't for BB firmly establishing her innocence in the opening scene, all signs would point to her as the primary villain of the event.
- Sequel Episode: To Serva★Fes 2018 - Servant Summer Festival!.
