Yes, but only if you are willing to jump through the hoops. The offline version of Kasumi Rebirth 31 (if you can find a real one) is functional but sterile. The experience is vibrant, alive, and surprisingly secure. The session key system is a minor inconvenience for a major reward: zero crashes, exclusive animations, and the knowledge that your settings will be waiting for you tomorrow.
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: Progress is made by interacting with the character through various menus. Version 3.1 typically includes expanded interactive scenes and improved animations. Yes, but only if you are willing to jump through the hoops