I'm posting this here since it's unrelated to his other LN series and not big enough for its own thread. Remember "The Zashiki Warashi of Techno Village"? It was Kamachi's first entry for Dengeki's IllustxStory collaboration project and eventually gave birth to "The Zashiki Warashi of Intelectual Village" LNs.
After checking Kamachi's japanese wikipedia page I discovered that he had written another short story for it in December 2014 called Game Therapy Ver.3.0.99 (ゲームセラピーVer.3.0.99). It's very short like all the SS in the project (I believe the "The Zashiki Warashi of Techno Village" became the prologue in Vol 1 of the LNs and that's why it's totally unrelated to the novel's plot).
I don't know anything about the story but if you know japanese you can freely read it (an other entries of the project) online
here. It's the story number 22.