Based on the game by Valkyria.
What are the apps in android that can download anime?
Animania it has thousand of animes, pretty much every anime is there, you can use it to watch or download many episodes simultaneously ( but one by one, you can select each episode and download it)
The only drawback of the app is the quality of video it ranges from (240–360)p which is relatively good for a phone has small screen but it’s not good when it comes watching on a tablet.
PS: every anime on the app is subbed, if you want to watch dubbed anime, you can download a separated app “Toon” it can be found alongside others apps on the left menu.