From this detailed guide, you can learn how to install Rakuten TV German Addon On Your Kodi.
ATTENTION: This provider uses the following technologies
Geoblocking and blocking of VoD-DRM-Streams on various Systems
Rakuten TV includes an AVOD-Service (Advertising VOD) with more than 10,000 titles available on-demand, including movies, documentaries and series from Hollywood and local studios, as well as the Rakuten Originals catalogue of exclusive content.
this installation guide applies to all compatible devices including Amazon Firestick, Fire TV, Android & iOS, Mac, Windows, Android TV, Android Boxes, etc.
How To Install Rakuten TV German Kodi Addon
- Open Kodi
- Be sure to have the Unknown Source box checked as Kodi requires this before installing 3rd party add-ons.
- HOME Screen > Add-ons > Settings button 
> Add-ons > Enable Unknown Sources.
- From your Home Click Settings (cog icon top left)
- Click File Manager
- Click None
-Type in the following EXACTLY https://tinyurl.com/kodinerds25
- Click OK
- Click back on your remote/keyboard
- Click Add-ons
- Click Install from Zip File
- Click kodinerds25
- Click repository.kodinerds.x.x.zip.
- Wait for Add-On Enabled Notification
- Click Install from Repository
- Click kodinerds Repository
- Click Video Add-Ons
- Click Rakuten TV German
- Click Install
- Wait till you can see the message Add-on installed pops up. That's it! You can now find you addon from main menu > Add-ons, enjoy.