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and if it is quite complicated to follow new series, many times they are isekais with absolute power unblocked in the protagonist and pure harem of females around him.

I guess this series is more focused on facing a dragon and that's it.
I have to assume that it will be only 1 season, so if they finish rescuing the mage from the dragon's stomach, I'll be satisfied with that.

Honestly many new series are copy and paste of the same thing, and many times without second seasons.
So to pass the time not watching anime, anything will do.