Overview: The older brother is crazy about Navi-musume,a high-performance autonomous AI for a smartphone app. Not only does she respond to him like a real person,but he is also comforted by the way she genuinely adores him and calls him "Big Brother." Meanwhile,his real-life sister Chie is rebellious and cheeky towards him... "In the end,you're just a fake Navi-musume sister and I'm just a fake girl!" The envy and jealousy that had been swirling in her heart,as well as other feelings towards her brother,explode... The hostile brother and sister end up caring for each other after all... In this erotic motion animation,they close the gap in a sexy and sweet way!!
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