Everything about this game would be 10x better if Azazel was just removed, instead it's just yet another clichéd Naruto fanfic. The only AVNs that have ever done the "there's a demon inside me" trope even slightly well are Companion of Darkness and Detective Necro, and this game certainly hasn't broken that trend.
Edit: Now that I've gone through the game to the current end (Ch9), I can say that Azazel is less annoying than I feared he would be, although he's still obviously used as a crutch to spout exposition.
Unsurprisingly, the strongest point of the game are the LIs, who are all well designed and likable, although they aren't especially deep characters. The overall story is actually not bad, but the writing itself certainly leaves something to be desired. The Slayer association and the guilds could be really interesting, but they're only explored at the surface level.
On the technical side the renders and animations are all good, but the fact that the H-scene moans are included in the "sound" slider rather than the voice slider is incredibly irksome, doubly so when the surprise sound effect gets spammed around 20 times at a certain point.