The game is explicitly pornographic, with uncensored (or mosaic-removed) content depending on version/patches. It’s known for its high-quality fluid animation (using the “E-mote” system), full voice acting, and a relatively simple narrative about a male protagonist staying at a rural home with the two heroines. The “hot” you mention refers to the explicit sex scenes, which are the main focus.
Special or ultra editions of anime or manga series often include additional content that provides deeper insights into the characters' lives, behind-the-scenes information, and sometimes even guides on how to incorporate elements of the series into your own lifestyle. For a title like "Sisters: Natsu no Saigo no Hi Ultra Edition," here are some speculative features that might be included under lifestyle and entertainment:
praise the "Ultra Edition" for its fluid lip-syncing and background animations (like moving grass and branches), which set it apart from standard static visual novels. Story & Gameplay Experience
: Players engage in a "daily life" loop with a mother and her two daughters in a remote house, participating in simple household activities like cooking, cleaning, and gardening.
Unlike standard visual novels that rely on static CGs and heavy narration, fully animated