Many "sei no gekiyaku vietsub 2021" search results lead to malicious pop-up ads or broken links. Always check the file size (Drama CDs are ~50-100mb for mp3; manga is ~20-30mb per chapter) and be wary of .exe files.
Reviews on IMDb note that the film critiques Japan's "work until you die" culture, showing how Katsuragi finds a reason to live outside of societal expectations. Critical Reception and Impact sei no gekiyaku vietsub 2021