can someone try and sell me on this game ?

It looks really interesting but it seems bit on the longer side
Others might do it better, but I'll give it a shot in the meantime.
Dohna Dohna is a futuristic RPG set in a dystopian city controlled by a powerful corporation. With your allies, you kidnap and pimp women from the city, with the goal of raising money and disrupt the corporation's plans.
There are two main game-play elements. The first one consists of turn-based combat through dungeons (city locations) in order to discover more of the city, find women, and find gear to upgrade your team and women's skills/gear.
The second part of game-play focuses on management and pimping of your women (talent) in order to make them as appealing as possible to prospective clients, and thus making as much profit as you can.
Throughout your progress in the story, you'll unlock new characters, skills, locations, and talent; some of which are accompanied by lewd scenes (I recommend installing the uncensored patch).
Responding to your prompt, the game is indeed interesting but is also fairly long. If you're looking for a game that you can complete in under 10 or 20 hours, this is probably not it.
In order to efficiently progress, there comes a point where the game requires more intense grinding. This can stem from a couple sources, but in my playthroughs, this was due to lack of money to buy gear, or just gear in general to upgrade characters/talent sufficiently to then fight bosses and get to the next step of the story.
Unless (and even if) you're using a wiki for the game, the drops needed for some upgrades are based on RNG and it can require re-running the same dungeon for (in-game) days and even weeks on-end to get what you need.
As tedious as this sounds, the completion of stages can be pretty fulfilling. I will note, after 50 days, I changed the fighting speed to quickest, turned off the in-game music/sounds and put on my own music in the background as the BGM was getting pretty annoying. I also wouldn't recommend playing this for more than 2-3 hours at a time, or else it becomes extremely frustrating and boring for some progression elements which get repetitive.
All this being said, It's an unconventional game which isn't for everyone, and will definitely take you a while to complete, but which I still really enjoyed. While I don't think I'll ever play it again, I would definitely recommend that others try it for at least for a couple of hours to experience what it's like, and to decide afterwards if they think it's worth the hassle for them.
(Oh and even though I personally turned off the music at some point, the art and music are triple-A quality and better than a lot of games out there).
If you want more input, you can read the
reviews (though some might spoil some stuff).