Depending on the specific release episode, Inma Keiyaku has been noted for utilizing modern animation techniques. Some segments utilize 3D CGI to enhance the fluidity of movement, which is a stylistic choice that distinguishes it from purely traditional 2D hand-drawn adult animation.
4.5/5
The most satisfying endings avoid easy loopholes. No "magic fixes everything." A great Inma Keiyaku romance ends with a true cost. Perhaps the succubus becomes mortal, losing her beauty and powers, aging alongside her lover. Perhaps the human becomes a lesser demon, forever changed, never to see the sun again. The romance is validated because they chose each other despite the cost, not because the cost was waived. Inma Keiyaku Sex Succubers