A girl in a mechanics workshop meets a submarine captain who owns a magical compass. The compass is not functioning, so he asks her to fix it. It turns out that the compass has showed him the way to the treasure he sought the whole time.
Overview：A girl in a mechanics workshop meets a submarine captain who owns a magical compass. The compass is not functioning, so he asks her to fix it. It turns out that the compass has showed him the way to the treasure he sought the whole time.
