The name appears to describe a fan-made or indie project related to the genre (a niche fetish involving bladder control themes) and

In the context of indie and adult game distribution, "RJ" typically refers to used on platforms like DLsite to catalog Japanese-produced assets and games.

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The update introduces branching paths depending on where you direct Kasumi to seek relief. Whether attempting to find a public restroom, looking for a secluded outdoor spot, or trying to make it all the way back to her home base, each choice alters the narrative outcome and difficulty. Gameplay Mechanics: How to Play

This report summarizes the status and features of the updated English version of the Simple Omorashi Game: Kasumi Edition Simple Omorashi Game: Kasumi Edition

The character's dialogue often provides hints on how to proceed.