Hello! Today we're taking a look at Suimin ○ Simulation 9 (Sleep ○ Simulation 9). This game is a simulation title developed by the circle Erofura-bu, falling under the genres of groping, clothed, uniforms, harem, sleepy sex, and group play/orgy. With 1,685 copies sold and a rating of 4.63 (based on 75 reviews), it has earned a relatively strong reception.

While specific details about the story and setting of Suimin ○ Simulation 9 are limited, the game's spec sheet makes it clear that the core gameplay involves using your mouse to undress and penetrate a girl — all without waking her up. As for controls: left-click to touch, while right-click, long press, and drag are also active in certain areas, allowing you to move things around. The cursor will change when hovering over something you can grab. The game window can be freely resized, though the UI is designed around a 16:9 aspect ratio — stretching it to extreme proportions, such as very tall vertically, may cause the UI to break.

On the gameplay and system side, the spec sheet notes several changes from the previous entry: the multi-player feature present in Sleep Simu 75 has been removed, fluid effects (saliva, applied semen) can now be reset, the shape of the full-screen shadow overlay can be selected from multiple options, and clothing removed from characters not currently on screen will now remain visible on the stage. You can also switch to the recommended display resolution via the Config button — the default is 1920×1080 — and fullscreen mode is supported.

Specific details on the characters and presentation in Suimin ○ Simulation 9 are somewhat sparse, but given the listed genres, players can expect harem elements as well as group/orgy content. On the visual side, the inclusion of customizable fluid expressions and shadow shape options suggests a notable investment in graphical quality.

Looking at the sales figures and rating data, the strong numbers indicate solid support from fans of the genre. The title also launched with a 10% discount for the first month after release, suggesting a strategy aimed at boosting early sales. That said, with 75 reviews, it may not yet be widely known outside of its core audience. While the spec sheet offers detailed information about the game's mechanics and systems, story and character details are sparse — meaning buyers will largely need to experience those aspects firsthand by playing the game.

All in all, Suimin ○ Simulation 9 is a title that delivers squarely on the needs of its niche, and it's clear the game has earned genuine support from its fanbase. That said, the finer points of the content and systems are something you'll really need to discover through play. Its ratings and sales figures speak to a certain level of quality, though it may still be flying under the radar for many. If you're considering picking it up, it's worth taking the time to get a solid understanding of what the game offers before diving in.