Kissanime has a huge collection of animation films, series with the combination of the mags/mangas. You can fetch any anime serials or shows, comics, etc because the Kissanime has everything.
Coming to the main part, if you feel that getting all the media files from a website can compromise your hardware. Or otherwise, the resource site will plant some spyware, a virus, or a bug? Then, it will not happen to you until you use the authentic Kissanime application.
The Kissanime has many authentic resources which do not engage in such malicious activities. Having said that, you shall remain aware of the mirror web portals or websites. Because these are the sources from where you can have a virus in your machine. Also, the creators of such websites can be anyone with ill-intentions i.e. hacker, a spammer.
Apart from that, Kissanime keeps updating the collection in a few couples of minutes. That eliminates the possibility of getting a malicious media file from the app or the source site. Hence, your device will be under safe operation until you keep using the authentic app.