Legend has it that Thomas Edison condensed his entire knowledge into his last invention, a screw, which now resides inside the skull of high-schooler Matsunaka Spica. Whenever Spica's thoughts reach a sufficient level, she is capable of designing extraordinary inventions that would otherwise be unfeasible to make!
Special additions:
Volume 3: Koisuru Edison (prototype), Juusou Shishunki-hei Teeneither