The title translates to "Sisters: The Last Day of Summer." It is an adult-oriented series known for its high-quality animation and focus on a summer-themed narrative involving several sisters. Hentai / Adult Animation. Origin: Japan (OVA).
If your media player says you need to "download a special codec" to watch the file, it is often a trick to get you to install adware. Use a versatile player like VLC Media Player or MPC-HC , which can play almost any file without extra downloads.
Filenames ending in part1.rar usually indicate a "split archive." This means the full video file was too large for a single upload and has been broken into multiple pieces (e.g., part1, part2, part3). How to Open and Extract the File