IS: the gift of a seeker

a mysterious individual rescues ichika orimura after his sister refuses to, instead choosing her career over her little brother, but this individual tells ichika the best way to get revenge is to beat her at her own game, he knows that ichika is smarter then most his mind rivals that of tabane so he gives the boy blueprints on a unit so powerful that tabane could never hope to compete, all he had to do was build it and train with it

the unit wasn't even an IS it was a suit of armor, instead of an exoskeleton AND it didn't use an IS core, watch what happens when ichika takes this and uses it to his advantage following the seekers advice and rising to the top of the world with his unique unit