Boku to Sekai no Euclid

The time I lived is dead, a sweet and gentle world
Will you live there, remain there, or disappear there?

Sagaminami City, a huge academic city in a certain region.
In the center of the city is a huge school facility, "Sagaminami Sogo Gakuen''
Nayuta Tachibana is an ordinary student who attends Sagaminami Sogo Gakuen.
He lived a serious student life, having fun and working hard on his studies.
Yet, for some reason, he found himself in a situation where he didn't have enough credits to advance to the next grade!!
If things continue like this, I will definitely repeat the year... Just when he is in trouble, she gets a flyer for a mysterious seminar that promises to give him credits.
"Come to my seminar! Seize the world of hope! What you want is here (units, etc.☆彡)"