Happy is in another world, bringing smiles to the inhabitants of Animal Village to earn EXP for Smile Heart, his key item as a Hero. It seems like a peaceful village, but a suspicious character has been going after small female animals. And his target is... Ururu the bunny! Can Happy protect her?! He also has other challenges to tackle, like searching through mysterious ancient ruins and fending off the advances of the lady fox thief Luna... Happy's new world adventure is heating up even more!