Source: http://www.animenewsnetwork.com/daily-briefs/2017-04-24/retailers-list-berserk-novel-by-anime-scriptwriter-makoto-fukami/.115211Retailers Amazon Japan, Rakuten, and Gamers! are all listing that Kentarou Miura's Berserk manga will get a novel that will ship on June 23 titled Berserk: Honō Ryū no Kishi (Berserk: The Flame Dragon Knight).
The retailers list Makoto Fukami and Miura as the authors. Fukami is the series composition writer for the new Berserk series that premiered last year, as well as the continuation that premiered on April 7. Fukami also wrote the script for the Psycho-Pass television anime series and film, and the Resident Evil: Vendetta film. He is also a novelist known for the Young Gun Carnival light novel series.