Once you have the files open, the code is written in a mix of Ren'Py Script (easy to read) and Python (logic-heavy).
While Team Salvato does not officially release the raw source code to prevent low-effort clones, the modding community has created open-source tools to extract and read the code. The most reliable ddlc python code link is found on GitHub:
Primary Repository: renpy/renpy (The engine itself)
Modding Tool Link: https://github.com/therationalpi/Unrpa (Extract DDLC archives) ddlc python code link
However, the most direct link to analyzed DDLC Python scripts comes from the DDLC Modding Community. You can find decompiled script dumps at:
https://github.com/DDLCModding/rpa-extractOnce you have the files open, the code
Important: These repositories do not contain pre-extracted copyrighted dialogue in a searchable database (to respect Team Salvato’s IP guidelines). Instead, they provide the tools and instructions to extract the code from your legally owned copy of DDLC.
rpa_extract.py raw file:
https://raw.githubusercontent.com/DDLCModding/ddlc-utils/master/rpa_extract.py
unrpyc.py (decompiler):
https://raw.githubusercontent.com/CensoredUsername/unrpyc/master/unrpyc.py
⚠️ Always verify scripts before running them. Only use tools from trusted modding communities (r/DDLCMods, DDMC). https://github