Instead of repaying their debt of 50 million gold, the Kube family send their 5th son,Uni instead as a sacrifice ..Poor Uni abandoned by his family found a ray of hope when his new master,Gran agreed to let him stay..& even asked his trusted servant to look after him...Soon enough Gran took a liking to him & assigned him to his new job as his "body pillow' .
It turns out our cute uni may be a legendary "Maneki cat" - which have rainbow eyes & seems to bring good fortune
Boku no Danna-sama