Fourteen-year-old Suzuki Iruma had just been abandoned and sold to a demon by his irresponsible parents! However, much to his surprise, he finds himself now living with the demon as his adopted grandson. He's then enrolled into a school where his doting "demon" grandfather, Sullivan, works as the principal. Thus begins the cowardly Iruma-kun's extraordinary school life among the otherworldly, meeting many colorful faces, taking on daunting challenges, and facing his true self as he rises to become someone great. Cozy magical slice of life with occasional urban terrorism.