Really enjoyed playing this game, but it also felt somewhat jarring in tone, both story-wise and art-style-wise. I think this jarring sense owes its root to the fact that the game is "inspired" by Ntrlegend and builds upon the latter's game mechanics. As such, the game mostly serves as a guilty "pleasure, " with emphasis on "pleasure." The guilt, if any, felt on the part of the player not of the mc, only heightens the fun. Though grinding is inevitable, it is also rewarding, as almost each necessary repetition of an action unlocks a new option for fun scenes.
However, the developer also introduces story elements. The hot spring episode, in particular, brings out the poignancy of one's beloved being corrupted and stolen. The game at certain moments during this episode turns into a "guilty" pleasure, with emphasis on a sense of guilt. Highlighting this contrast in tone story-wise is the art style vacillating between animated 2.5d mini figures and CGs more in tune with Japanese adult animation. As a result, the trivial fun that is Ntrholic can at times verge on serious drama. This is not necessarily a bad thing, but jarring nonetheless, and certainly not something I would expect from an Ntrlegend kind of game.
On a side note, I don't think the succubus elements are necessary. While providing some fap material, they are not really adding much to the game mechanics. I mean, what's done by the supernatural corruption skills can also be done in the non-magical ntr ways. It seems to me that the developer just wants to have something different from the model game. But in this particular case, being different is not the same as being better.