This is a pretty fun and addicting game. The Futa tag is because there's is an elf girl with dick (you can fuck her.... and have to do it to proceed the story). There also an option allow you to be fucked by another futa girl... but only if you really want to do it......
Story: Well the story isn't that deep, dark or addicting... It's pretty normal and decent. You're a boy, "magically" received a power to become an incubus (male succubus). You will go around the town, solve many puzzles in order to fuck all the girls. I like the way the game tried to make a plot twist with a dark reason behind all these things and i appreciate it.
Gameplay: I really enjoy it, there's no reason to hate it at all. Unlike other RPG where you have to waste your time farming all the material, leveling up and blah blah, this game is more about solving quests and puzzles. Depend on time and your lust level, the game will change and your job is to use it as your advantage in order to fuck the girl you like. Each girl has her own puzzle, which requires you to do this, do that... and every NPCs in the town will change their location depends on the time of a day (morning, afternoon, night, midnight). Not to mention that their interaction with MC will change too. Some puzzles are kinda hard and requires you to do a lot of small preparation, which can be easily missed if you didn't pay attention.
CG: 1,2GB so... you get it, there are many scenes in here. Because the MC is a shota incubus so... prepare for it. A small tip is that you should interact with other NPCs near the girl you want because they will give you some small hints about how to get her. Be sure to read the conversation carefully because some puzzles requires a specific time of a day to do it. Some NPCs will change their places as time flows so watch out for it too.
Although this game is pretty good, it still has some drawbacks. Unless you know what to do, most of the time, you will go around and talk to tons of NPCs with meaningless lines (only a few of them actually give you some hints). Because there is NO SKIPPING in this game (Ctrl/Shift to skip dialog or skip the time)... so if you end up interacting with a long talking NPC or trigger an old H scene, good luck with that. That means you have to waste lots of time for meaningless conversation if you don't know what to do. So be careful with that. Another thing is that there is a 30 minutes ending arc with no gameplay. All you can do is press Z/space and watch a whole 30 minutes novel, which is really boring and time consuming. The ending isn't bad, but how they did it is really bad. Forcing you watch a 30 minutes story only isn't a good way to end the game, especially when there's no alert for it. REMEMBER: If you find an ID card and there's a long line at the south side of the city, DON'T GET IN THERE UNLESS YOU WANT TO END THE GAME.
In sum, this is a really great puzzle game and I had a lot of fun time with it. If you enjoy solving puzzle or hate farming level in RPG, then this is for you. Despite a 30 minutes ending, other things are pretty good and can't complain. Good luck and have fun with it.