Here we have an isekai story with game elements revolving around tower or more precisely dungeon defense. The main character gets summoned into a fantasy world by an intelligent dungeon core in the shape of a little girl and is tasked with developing the dungeon or else they will be killed by monsters/humans that invade the dungeons for treasure. The series centers around the main character developing the dungeon, which involves creatively finding ways to exploit the rules of the dungeon system and gathering allies which for all intent and purposes just end up mostly being cute girls, cause yes this is a harem series.I’d say the biggest appeal of the series rests with the dungeon battles. The main characters will occasionally get invaded by adventurers or challenged to a fight by dungeon cores. As a newly established dungeon that is heavily outmatched in terms of resources and experience, the main character constantly has to find creative ways to defeat his opponent, and often in comedic ways at the expense of his enemies. *BEWARE THE GATE OF WISDOM” you’ll get it soon.

Overall it's a decent adaptation from a Light novel that has been going on for a while. I just wish the art was a bit better but it gets the job done. If you catch up with the manga, I’d definitely also recommend giving the Light novel a try.