Ok! Here we go review time by me!
First things first I will have a TL;DR at the end so if you want to skip there just do it.
Ok once that is out of the way I firstly want to just get into the whole setting. As a lore person from league it is pretty accurate for the time as I know because we know from Ionian and Noxian lore that Noxus invaded Ioania and forcefully took over etc. This all starts with Riven being a strong soldier commanded by Saulla in the conquest. and fast forward we then have our young lovely Riven angry at Saulla for his behavior and how he handled this thing so she wants to stop his behavior and the treacherous acts he is doing.
Then we start off the game and if you do not follow the guide you will most likely be lost, like a 100% lost trust me this game is not some simple must spam space and watch the story progress rather you need to pay attention to the wordings of key characters and depending on your choices you affect certain scenes in the future. Or what I did which I recommend if playing this game is to use a GUIDE which can easily be found. Using this guide simplifiesthe whole game A LOT and you basically get maxed out with all the things you need. There is pretty much no need for grinding monsters as the storyline and sidequests feed you up. So story wise this game has nice progression and just follow the guide and you should atleast if you barely paid attention know what is going on and what the characters have planned and do.
Characterwise its still great. Riven fits Riven as a person, Irelia is seemable humble but douchy towards Katarina which is a very good plot point, Leblanc is like the trickster and is helping your team in the sense of guidance towards your little alliance with her. Then we got my favorite, Katarina! I just loved her character. All the scenes went so well with her character then alongside with Riven who is sexual but reserved and Irelia who is a douchebag towards her just clicked so good. So if you are into some super small catgirl fight speech by them that has good revenge scenes such as when Katarina being held hostage and Irelia tells you to steal from the minotaurs because "they probably wont notice" whilst knowing they literally told your group they will keep a tight eye on everyone and espically so you're not stealing. In terms of character development Riven goes from shy virgin reserved to a subtle free of use whore but the game advances her character well as the story goes along. Irelia pretty much has the same behavior but sort of is already open sexually towards nature etc that needs balance (e.g. Dyuu). As the plot progresses she then begins to help Riven with her sexual acts and helps her to learn to be more seductive or helps her by making her have sexual intercourse with others. Leblanc is more mysterious than for me because of the original league lore but she has a pretty flat character meaning that she keeps the role of leadership in the alliance and guides Riven towards the next achievement in order to defeat Saulla. Katarina though goes from her bratty noxian princess to an absolutely different character execpt for her hostility. Great example is when she gets raped by the minotaurs and kinda starts to like getting raped by feral-esque creatures. Fastforward towards the stable when the horse rapes her and now the big ranking assassin is addicted to getting fucked by feral things. And the reason why I say now her personality alongside Irelia was a great choice in terms of smut and story was due to their potential revenge scenes where Katarina who gets comments of being very very horny while getting fucked by non humans suddenly comes back when she is in charge and has the dog fuck Irelia.
Fast forward again bit short on time but in terms of environment it is very nice due to the whole isolated curfew where outsiders do not really come and you can only focus on the place you're at. I kinda found the last map hard with Saulla but the boss easy. I think the monsters are nice to fight and fit their theme. It is not very repetitive because the different locations offer different needs of accomplishment by the alliance thus always having some sort of variation to not get bored out of.
Combat now is something you need to understand a bit. My personal favorite playstyle was maxing out Riven and Irelia then use Dyuu as a lurking healer in the early game. Katarina gets oneshotted so easily by the mobs and in my opinion its not even worth giving her the pendant of lust to recieve less damage rather give it to Riven or Irelia because you will need their survival in order to win. I recommend if multiple targets to use this combo. Riven AoE attack (think its broken wings), Irelia blade surge, Dyuu lurk and Katarina dagger throw(bouncing blade). The reason is because Riven does a lot of dmg and debuffs the enemies and potentially kills all of them. Irelia's blade surge is also strong and attacks almost first in everygame with it (if your Riven isnt maxed out and level 27). Dyuu should lurk in the beginning to get his TP up incase of need of sudden healing and be played as a healer. Think of Dyuu as your hidden trump card in plain sight that is broken and literally like carrys every fight. Katarina combatwise is weak imo. Her dagger throw is great because it attacks 3 random times and reduces the DEF of the enemy. So in most fights you encounter just use this combo and you should be good. If they survive use runic blades on Riven, if you dont care about spending mana then blade surge again on Irelia, Dyuu can be chosen to be offensive if you have the poisonous goo and Katarina just use her sinister steel or death lotus if you have it.
In terms of fighting anti magic people just spam attack and have dyuu lurk then heal your teammates. Literally the most effective strategy I found.
Then bossfighting to increase Dyuu's stats. These bosses are literally harder than the final boss imo. Playing around your team is key here and in most fights its playing around Dyuu, Irelia, and Riven. Think of using Katarina as a shield. Revive her when fighting for the boss to attack and you get a free round. An example of this would be against the lethal tentacle that does 9999 dmg on every single hit attack. The way I played around him was using runic blades and whatever available on Riven but I preferred Runic Blades and broken blades the most. Irelia is literally spamming blade surge but you should Equilibrium Strike in the boss fight in the beginning to slow them. Found it working for me! Also dont forget to use her Transcendent Blades espically when against bosses and they got low HP because it does roughly 1500 dmg. As for Dyuu its the same. Trump card lurk get TP then choose wisely like a battlefield commander and advance your main troops Riven and Irelia. Katarina was barely effectively used by me execpt as for her bouncing blade to reduce enemy defense. But with the boss fights this is how I got around it. Riven and Irelia do dmg. Dyuu heals/resurrects and Katarina bouncing blade do as much dmg before she dies. These boss fights is why I said to max out Riven and Irelia because they are your main damage group. Its better for them to survive blasts and take 500-1000 dmg than get a 2,1k dmg oneshot. And if that were to happen and you got like 51hp on Riven the simply just use her as normal of if you are risky use her last buffing ability, then Irelia uses hiten strike to heal her hp or Transcendent Blades to heal up. Dyuu uses his healing goo on Riven and then you're pretty much done. 3 Full hp characters.
The last slimefight for Dyuu is the hardest one. Literally even harder than the boss and the previous slime bosses. You find him in the dark right where the first ghoul you encounter is outside the cave where you first saved Leblanc. He is so strong and the sole reason that made me realize to put lust defendants on Riven and Irelia and max them out then potentially Dyuu. In that fight use Riven and Irelia as dmg dealers, Gyuu as lurker and Katarina if possible use her bouncing blades. KEEP IN MIND THAT IF SHE DIES RESURRECTING HER IS A GOOD IDEA! Then its 1/4 that can get hit and if she gets hit its another free turn for you to deal out damage! Eitherway once you get used to this strategy everything in the game should be easy!
Lastly, storywise its nice and I like it because it is something that actually could have happened in Runeterra smut lore in my opinion and it advances well with interesting events my main favorite being the personality changes to Katarina and Riven but the plot progresses reasonably quickly which is needed unless you'd want a 20 hour stretched out game.
SMUT! Smut in this game is actually fitting and well chosen for the characters and isn't something like some generic h-game rather actually got some thinking into it and most importantly they can fit very well with the plot of the place/story.
Wasn't my best review done but hope it informs some of you my thoughts about this game.
tl;dr It got nice story, art and combat but my favorite is the character development and how well the HreinnGames tied it togheter. If you play itjust follow a guide and then choose your likings on whom to increase affection etc with and you should be chill. Keep in mind it is a rather long game but it enjoyable even outside of the NSFW terms.