Yukiguni

Develop an interactive 3D winter narrative application centered on three core core environments: a quiet rural train station, a cozy private house, and a vast snow-covered forest, all rendered with immersive snow-laden visual details to build a tranquil, wintry atmosphere. Design core interaction mechanics for users to freely switch between observation mode and free walking mode across all scenes, set up scattered memory point triggers that activate when users approach or click corresponding locations, and integrate a linear train sequence flow that guides users through a key narrative segment without disrupting overall exploration freedom. Implement a branching choice system where every user decision during story progression directly alters the content and design elements of the final postcard users receive upon completing the experience. Add dual-language support for full in-app content, allowing users to toggle between English and Chinese at any point, embed high-quality ambient audio including distant train rumble, wind through snow-laden pines and soft piano background tracks that dynamically adjust based on user location and interaction context, and design a narrative fragment collection system where users can unlock hidden story snippets by tapping on interactive objects in the environment and adjusting camera angles to specific preset perspectives. Ensure all interaction feedback is smooth and low-latency, keep the overall UI minimalist and integrated into the winter scene aesthetic, and optimize both scene load time and operation fluency to deliver a calm, immersive storytelling experience without unnecessary disruptive elements.