DLsite: https://www.dlsite.com/maniax/work/=/product_id/RJ01317267.html
DLDShare (dlsite alt): https://dldshare.net/archives/721458
VirusTotal RunawayGirl_SweetDays.exe: https://www.virustotal.com/gui/file/5c7a0040f335fc8d80487252352de99686e646197711c82c1e7a8574fa1a894f?nocache=1
VirusTotal Installer.msi: https://www.virustotal.com/gui/file/e57bb71feaf54f656c19dc35698d83fe24141b79134ca1a240c3bfbced0047f4?nocache=1
VirusTotal setup.exe: https://www.virustotal.com/gui/file/8dac374bd252ee80113d067ea07308c9b569cfac2d76ebc0b8bf6386d1226d44?nocache=1

Taken from hentaibanchi.
This only includes DLC to the first game (which you need the original game of I think) and Story 2 with the new girl which you can play right away. If you don’t have the original game, you can’t play the DLC story.

Slow seeding at first.