Take Dongfu to Another World

What is a cave? The cave is a place where wheat can grow like radishes. Dongfu is a place where you can eat summer watermelon in winter. (If there are no watermelons there in winter) The cave is a place that can make up for the regret of meeting a girl in a remote place but not being able to have sex with her. The cave is something that allows you to take the heads of enemy generals among thousands of armies. The cave is still an angel's nightmare... The cave is also the beginning of plane colonization...