Very short, with good art but little variety.
Combat and most RPG mechanics aren't a focus at all, you can't even buy weapons, armors, etc. On the plus side, that means grinding is also nearly nonexistent.
Story is meh, i skipped basically everything. Part of it might be the not great machine Translation.
Corruption is also pretty basic, most of the time you clear one of the 4 dungeons the game has and "rank up" your corruption to unlock the next stage of the H-scenes.
To conclude: i still don't regret giving it a try, since it doesn't waste time at all.