Renata's parents are world-renown explorers, archeologists and inventors that travel all over the world uncovering the secrets of the past, bringing her with them in their expeditions. However, in their latest adventure, they decide to leave her at the base camp - the Beelzebub ruins are said to be too dangerous! For three whole days she waits, her pride hurt and bored out of her mind, until she realized: if they haven't returned yet, something must have happened to them! In a hurry she grabs her parents' last invention, the Frogun, and heads to the ruins to rescue them, and prove that she's as capable as them!