I'm sorry, I haven't played this visual novel specifically. But generally, visual novels often have unique storylines, characters, and art styles. It might be about the relationship or experiences between 'boku' (I) and 'joi' which could be a character's name. The 'shinsatsu nisshi' part might imply some sort of inspection or observation diary within the story.
I'm not familiar with 'boku to joi no shinsatsu nisshi visual novel'. However, in visual novels, they can cover a wide range of genres such as romance, mystery, or adventure. Maybe this one focuses on the daily interactions and developments between the main character (boku) and Joi. Without more information, it's hard to say exactly what it's about.
Since I don't have first - hand experience with 'boku to joi no shinsatsu nisshi visual novel', I can only speculate. Visual novels are known for their narrative - driven gameplay. It could be that the story unfolds through the protagonist's (boku) encounters and relationships with Joi. The 'shinsatsu nisshi' might be a key element in structuring the story, perhaps documenting their journey or experiences in a diary - like fashion. There could also be various sub - plots and secondary characters that add depth to the overall narrative.
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