3D여자친구 is a virtual girlfriend simulator designed for iPhone users. The program offers users the experience of interacting with virtual girlfriends through various dialogue options and customization features.

Players can engage with four different types of virtual girlfriends: the innocent type who offers to bandage any injuries, the cool type who casually asks for space in a crowded hallway, the quirky 4D type who finds octopuses cute and releases them in the bathtub, and the tsundere type who challenges understanding her personality.

Through conversations and customization, users can win over their virtual girlfriend's hearts and decorate them to their liking, providing a unique and personalized virtual relationship experience.