Setsuna is a perverted instructor who is unable to invoke magic.
As a part-time lecturer at the Royal Academy of Magic, he continually tells his students to self-study.
The new students who entered the academy with high expectations are disappointed in Setsuna, and judging him to be incompetent, they challenge him to a Guess duel.

"": Will you resign if I win?
"": "I"? Surely you mean " we." All of you have been pretty annoying, so I want you all to take on me. But in return, you know what will happen if you lose, right?

Setsuna plays with the special students, who are the best in a hundred years, with perverse and astonishing magic that is unthinkable in common sense!
But behind the demon-like behavior, could there be a true purpose...?

Average high school student Mikagami​ Kouji is a hardcore gamer. One day he gets isekai'd and he only gets the skill "copy" which is apparently useless but we all know it's secretly OP or something. He's enslaved to be a gladiator by his summoner, the big booba, head priestess Zayd. He has to fight in the Colosseum and if he loses he gets raped.

One day, a boy who loves Insects, "Anri Kajimi," meets "Makiri Oka," an Insect girl (Konchuki) who came from 100 years into the future. Oka, who is a "Konchuki" who has the characteristics of a human being and a insect, presses him into "mating with her"