 If you liked
Toaru Kagaku no Railgun
|
 ...then you might like
Maou 2099
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Urban fantasy setting with both magic and science.
While Toaru Kagaku no Railgun's main characters are school girls and Maou 2099's main character is an ancient demon lord, both have a similar vibe with their futuristic urban fantasy setting, where magic and high tech science coexist. Both have a mix of action, fantasy, sci-fi, mystery, comedy and slice of life which make it an enjoyable diverse watching experience. Both are also from the same studio and have pretty good animation and soundtrack.