The version of Nekopara Vol. 1 available on Steam is an "All-Ages" release. This means it is censored to comply with Steam’s content guidelines (at the time of release) and is suitable for a general audience. However, the developers, NEKO WORKs, officially offer a free patch to restore the game to its original adult-only visual novel state.
: Availability may vary by region; for instance, it has reportedly been blocked in Germany. Nekopara Vol. 1 Steam 18 Patch
The patch does not just add nudity; it restores the game to its original Japanese release state. The version of Nekopara Vol
. This DLC restores the adult content that was removed from the standard Steam version to comply with older store policies. Content Restored Nekopara Vol. 1 Steam 18 Patch