I cannot remember too much about this manga other than the fact that the MC was a powerful hypnosis user in his class. The world had psychic teen soldiers and he was the only one with hypnosis, he was also obsessed with a girl in his class. He used a sword, I believe, to fight.
A big point that I remember is that in a chapter or few he had revealed he used hypnosis on himself to train his body and study multiple martial arts at a danger to his own body due to the strain.
The world was at war with another entity, I cannot remember specifically how to classify them, but these kids had psychic abilities to fight them.
It is not Code Geass, it is not LOST+BRAIN, it is not an isekai.