In this modern magic action story, Takeshi Nanase is an ordinary high school boy who has a somewhat dark past. Due to certain circumstances, he formed a "fake" couple with his childhood friend Kurumi Isoshima, but otherwise, he lives a normal life. However, one day, he comes across a girl named Mui Aiba, in a uniform he has never seen before, collapsed on the school campus. This encounters changes Takeshi's destiny completely. Mui tells Takeshi that she is a magician, and she apologizes, for she turned Takeshi into a magician, too. What Takeshi once knew as one world is actually two—the world where magicians live and the world where humans live.

You have the sexually curious imouto, the erotic school nurse, and the cute, over-protective parasite that comes out of our MC Karuto's stomach.

"The Most Incompetent in This World"—it was the gift Kai Heineman received from the Divine Oracle when he was thirteen years old. Due to that gift, his physical abilities plummeted. His growth rate became the lowest in the world. Yes, the gift was supposed to make him a target of everyone's mockery and pity. However, this gift had something that no other gift had, limitless growth. Moreover, by chains of unfortunate coincidence, Kai Heineman ended up being trapped in the worst, nightmarish dungeon. The dungeon disconnected him from the passage of time in the outside world. This allowed him to train for a really long time while just a moment passed in the outside world, without ageing even a single day. This chain of misfortunate events led to the birth of the most powerful supreme being in the world. This is the tale of the loner, whose common sense got so distorted after he spent too much time talking with his own sword that he brought out the subordinates he had subjugated in the dungeon to wreak havoc in the outside world. (Source: Shousetsuka ni Narou, translated)

The war between humans and witches has ended. Quo, a girl who is the ultimate superhuman soldier also known as a "Witch Hunter," receives an order to "hide her identity and live a normal school life" in order to prove her own safety. If she fails, she will be disposed of immediately, making it a life-threatening mission. However, she has an even bigger problem. Quo is extremely shy and has the weakest communication skills. Furthermore, at the school where she infiltrates, she meets Luca, a survived enemy who desires peace, and Noel, a junior "Witch Hunter" who transferred to the school to monitor Quo's mission --!?