A coup occurred in a certain country. The princess who could barely escape meets the hero after that. However, as a result of covering that princess line, the hero who is surrounded by enemies and falls into a dilemma. A mysterious voice echoes through it.

"Do you want power ...?"

The hero have no choice but to respond. Then the mysterious castle emerges from the ground! That power overwhelms the enemy and fights off. And the mysterious creature appears, Otton.

"You contracted with a castle Shitandao. Continue sacrificing libido instead of using the power of the castle! Libido, that is, a sacred triangle that is a daunting girl's maiden! "

It seems that you have to collect underwear. Furthermore, from the principal, we can offer counseling to regain the state.

"If you examine the old literature in the castle, you will surely know how to be released from that castle! So, to reach the King's Castle, please help me to regain the country! "

Thus the hero will go on a journey to regain the country while collecting underwear ...