The story typically follows a "coming-of-age" theme during a summer setting, focusing on the relationship dynamics between a younger, "cat-like" male protagonist and an older female figure or a peer.
You have located the of the Nekopara series. It is a nostalgic look at the childhood of the main characters. If the file is high quality (which "exclusive" suggests), it is likely a collector's rip of the OVA special promised to Kickstarter backers. nekopoishounengaotonaninattanatsu01 exclusive