The game has been consistently ranked highly on both Nutaku and DMM. Nutaku has run multiple rewards campaigns based on good performance. In addition, the game appears to be going strong in Japan with regular content updates. KamiPro is essentially the new Aigis. As far as stability goes, it likely doesn't get any better than this for Nutaku ero browser games.
Ironically, that success hasn't been mirrored on this site, as the game doesn't even have a developed English wiki. If you'd like some further personalized advice, contact me on Twitter or the unofficial Kamihime Project Discord and I'd be happy to share my knowledge. I'm one of the more active users here and I specialize in analysis and theorycrafting.