Re:Fraction

"A gathering for Log Horizon fans, to experience the "Catastrophe of the past" to the "Refraction of the future"."

- Event tagline

〈変転〉Re:Fraction - LOG HORIZON illustrations - was a real-life gallery event that took place between May 3–4, 2018. (Which is, in-series, the date when the Catastrophe occurs.)

The gallery featured Log Horizon illustrations by Hara Kazuhiro, with some guest features by other Log Horizon-related artists such as Souchuu (mangaka behind Log Horizon: Nyanta's Fortune Recipes). Along with illustrations from existing volumes, teaser images and story snippets covering the "third part of the series" (Volumes 12-16) were shown.

Also published for the event was a new short story written by Mamare Touno titled Refraction, or Maybe a Barbeque at Log Horizon (変転あるいは〈記録の地平線〉のバーベキュー). The story was published digitally after the event's conclusion.

Teasers
Three posters featured upcoming story content for the series:

The first poster's tagline read: "From the 'Catastrophe of the past' to the 'Refraction of the future'". Two illustrations were featured: one was Krusty, Tycoon Lord's color illustration depicting Krusty, Hua Diao, and Gumon. The other was a new illustration (likely from Collapse of the Round Table) depicting Shiroe, Isaac, and Calasin with Eins turned away from them.

The second poster contained a snippet from Volume 15: Coppelia, Tiered Islands. Its tagline read: "I am Susabo, the Ocean Barrier. I control the ocean boundary." The illustration was a sketch featuring Elias Hackblade, Kanami, Leonardo, and Coppelia struggling against Susabo.

The third poster contained a snippet from Volume 16: Theldesia's Friday. Its tagline read: "I hope to compare answers, big brother." Its illustration was a sketch depicting Shiroe's meeting with Roe2 at Log Horizon's guild hall.

Trivia

 * 変転, whose ruby characters read Refraction (or Re:Fraction), translates to "transition" or "change".