 If you liked
Isekai Ojisan
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 ...then you might like
Tsundere Akuyaku Reijou Liselotte to Jikkyou no Endou-kun to Kaisetsu no Kobayashi-san
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The core of the plot for these series involve the constant switch between "reality" and a "fantasy/video game-like" world where commentary from one side as well as the actions inside the fantasy world make the series what they are.
Also Tsunderes appear....