While technically not Sogna, the same folks put out some earlier, non-adult titles under the Silence brand. The Guynarock series, in particular, was one of the first PC-98 games I discovered in my youth. Although the first game was later remade under the Sogna label as Galactic Guardian Guynarock R, the original version still remains my personal favorite. As such, when I took up romhacking translations as a hobby, this was the first series that came to mind to attempt. While the first game was a bit opaque for a novice attempt, the sequel, using the first version of the SGS.COM engine, allowed me to begin to dissect and understand how these games are built.
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Guynarock II - english patch ver. 1.01 https://archive.org/details/guynarock-ii-eng-patchWhile I was able to decipher the script files and program enough to do the work, my lack of Japanese knowledge saw the project put on hold. It wasn't until I offered to adapt my tools for a translator working on a project of his own, BabaJeanmel's Holy Girl Force Lakers translation, that I was really able to apply what I had learned. After working on a few projects, he returned the favor by doing a rough translation of the Guynarock II script which I edited into its final state in this patch.
With a good understanding of the SGS.COM engine, BabaJeanmel was interested in working on some of Silence's other games built off it. Thus the tools were adapted the Jewel BEM Hunter Lime and Exciting Milk series were both translated.
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Jewel BEM Hunter Lime - ver. 1.1 https://archive.org/details/pc-98_lime_enExciting Milk - ver. 1.0 https://archive.org/details/milk-en-1-0There are only a handful of other games under the Silence brand, but they don't use the same engine. Hopefully, one day, we'll have them all available to play in English.
Games remaining:
Silver Battle God Guynarock
Minimum Guynarock
Cyber Arms Val-Kaizer