That RJ number corresponds to an sold on DLsite. The main feature of this work (based on typical Goblin no Suana style) would include:
The year is 1573, but not as history remembers. In this timeline, Japan’s warring clans are replaced by rival gakidou (楽堂 – literally "music halls" but used here as "battle academies"). The protagonist, Goburo , is a lowly goblin who stumbles into the abandoned lair (suana) of a legendary oni general. Inside, he finds a magical shamisen that, when played, allows him to command both goblin hordes and human students who have been transformed into battle-ready "warriors of the hollow." goblin no suana sengoku gakidou rj01232863 2021
(RJ01232863), depending on where you are sharing it (e.g., a gaming forum, social media, or a review site). Option 1: Enthusiast/Review Style That RJ number corresponds to an sold on DLsite
: Significant improvements in UI and character art compared to earlier iterations in the 2010s. World Expansion The protagonist, Goburo , is a lowly goblin