At its core, Jashin Shoukan involves the act of summoning or invoking entities, often referred to as "Jashin" or "Evil Spirits," from other realms or dimensions. These entities are typically sought after for their powers, which can range from granting wishes to bestowing magical abilities.
This refers to the relationship between the characters involved, adding a layer of taboo.
If you're interested in learning more, I encourage you to explore reputable sources and online communities that discuss this topic in a responsible and respectful manner. Approach with caution.