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Extracting is only half the story. To apply translations or mods, you must repack the modified files into a new .xp3 archive.
import struct import zlib from ctypes import c_uint32
Visual novels are famous for their beautiful art and music. Unpackers allow you to save these assets for personal use, such as wallpapers or study material.
The XP3 archive format (also known as Kirikiri archive) is a proprietary packaging system used primarily by the Kirikiri (TVisual) visual novel engine. This paper analyzes the structure, encryption methods (specifically XTEA), and compression (zlib) used in XP3 files. We present the design and implementation of an "XP3 unpacker"—a tool for extracting contents from encrypted and compressed XP3 archives for legitimate purposes such as data recovery, localization, and security analysis. The paper also discusses the legal and ethical boundaries of reverse engineering such formats.