 If you liked
Zero no Tsukaima F
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 ...then you might like
Isekai wa Smartphone to Tomo ni.
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Both the protagonists Touya and Saito have a Dukedom of their own and are masters of a castle where many women who love him are living with him. The difference is that in The Familiar of Zero they fight for his affections whereas in In Another World with my Smartphone, they are on the same page and want to share him. The concept of a unique magical world is also common to them.