You can still find the original Japanese freeware version (v1.08) on legacy community sites and the developer's blog . While free, it may require tools like AppLocale to run on modern non-Japanese Windows systems.
The Steam version offers several DLCs that add characters, story modes, and technical features: Vanguard Princess Free Download (v1.8.7 & ALL DLC)
A Vanguard Princess Mobile (PC Port) Demo is available for free on Steam, featuring updated UI, remappable controls, and a new "Records" system. Official DLC Content You can still find the original Japanese freeware
Often available as a free update/DLC on Steam, adding uncensored content and minor gameplay adjustments. Vanguard Princess - Steam DLC Page Official DLC Content Often available as a free
An updated, uncensored version featuring the "Daughter of the Devil," new stages, and alternate endings.
The version published by eigoMANGA on Steam is a localized PC port that includes bug fixes and various paid DLC expansions.
Focuses on the character Kurumi Mirumati with an updated game version and new story content.