Midara na Mahoutsukai to Kyuuseishu | 淫らな魔法使いと救性主

A long time ago, succubuses freely go to the human world in the Succubus kingdom in Hell, every day when it devoted one's time to the sex act was spent. However next generation's Succubuses magic declines gradually by the breeding act with human, then interference to the human world is prohibited, they held off the race decline by managing their sex.

Time flows, modern human world. A student Kuyou Hoshito which is not outstanding, it passed through the school gate to leave school... should be so. Scenery and the alone woman that i have not seen to the presence for some reason.

According to the story of queen Lila of the Succubus that says that it summoned it, the Succubus in this world Succubus kingdom starts the management of sex in the distant past, as a result of having continued living life that depended on magic, there are convinced that it is a witch. Moreover manners that dislike the sex act with the filthy root, the sex leaving has become aggravated. However originally because the Succubus, it is said that there is danger of the life if the sex act is not done.

Then to prove the necessity of human and sex act like old days, it places a curse at two witches who have the influence in the Succubus kingdom, to solve the curse, i accidental seem to have been called. Though hoshito that cannot deeply understand the situation, choices to return to the house were not.

Thus, hoshito will be "Training" the two witches by the name called "Relief". Really is the Succubus kingdom saved and can it return to the human world safely?