Image source: ANN.
The story begins when 30,000 Japanese gamers are trapped in the fantasy online game world Elder Tale. What was once a "sword-and-sorcery world" is now the "real world." The main lead Shiroe attempts to survive with his old friend Naotsugu and the beautiful assassin Akatsuki.
Touno debuted his novel on the user-generated content site Shōsetsuka ni Narō in 2010. Matsu launched his Log Horizon Gaiden Honey Moon Logs manga adaptation in ASCII Media Works' Monthly Comic Deneaki Daioh magazine last year, and the latest installment is running in the magazine's March issue this Saturday. Kazuhiro Hara began serializing the main manga adaptation on Enterbrain's Famitsu Comic Clear website last year, and Koyuki began drawing another manga called Log Horizon ~Nishikaze no Ryodan~ in Fujimi Shobo's Age Premium website last year also.
Source: 0takomu and ANN.