DLsite: https://www.dlsite.com/maniax/work/=/product_id/RJ01427462.html
DLDShare (dlsite alt): https://dldshare.net/archives/749614
Latest version, Ver2.04, taken from hentaibanchi.
Previous version of DLC here
Just copy paste the contents of DLCパッチ into the main game's folder and overwrite
Slow seeding at first.
次元計劃