I will preface my review with this: Play the side stories and mini-games.
9/10, and I ain't even halfway through the game yet.
Winter Memories improves on the prequel, Summer Memories in every way possible, and I initially went in not even wanting to play it, because I was somewhat bitter and irritated how, no matter how I filtered my searches, this game and it's prequel kept coming up at the top of all the ratings of all the websites and game distributors for adult games.
I DIDN'T WANT TO LIKE THIS GAME, AND I DO ANYWAYS.
A lot of the H-Scenes aren't my taste, are mostly just smut for smut's sake, and lean heavily into kinks that I actively don't like-
BUT-
I play it anyways because it's a DAMN GOOD game, and parts of the side stories are genuinely too damn entertaining to not enjoy.
This is a 9/10 game with an 8/10 cast, 7.5/10 H-Scenes, 10/10 gameplay (for a life sim), and as a BONUS, a 10/10 Shonen that's BEGGING to become an actual series on it's own.
I PLAY THIS GAME FOR THE MINI-GAMES DAMMIT!
Most of these waifus can go to hell if it means MORE MENTAI BEING A SHONEN PROTAGONIST-
I swear to god, they did not have to go THIS hard for a side story/side mechanic in a series, BUT THEY DID, and though it's often played for laughs because of how corny it is, I WOULD BUY A WHOLE FRANCHISE, that's just the Menko equivalent of Yu-Gi-Oh/Beyblade/Bakugan, with some harem shenanigans happening on the side/in the background.
I CAME TO GIVE IT A CHANCE-
AND I'M ANGRY TO ADMIT MY EXPECTATIONS WERE NUKED-
The best romance in this series is the bromance between Boku and Mentai basically just being two completely different genres of protagonist, and still being best friends anyways.
We've HAD Boku being a harem protagonist with Shonen hijinx happening in the background, NOW I want the other side where it's Mentai being a shonen hero, with Boku in the background getting into hentai hijinx.
This is unironically, the best character dynamic I've ever seen in an H-game, and it has NOTHING to do with the hentai AT ALL.
GIMME A SPIN OFF CALLED "MENKO MEMORIES", AND I WILL DIE HAPPY AND LAUGHING.
The rest of the game is good too by the way, this is just my favorite part personally, this game has some tags like "urination" that are a turn off for a lot of people, but honestly, if you can get past that, this is one of the most in-depth H-games in terms of actual gameplay I've ever seen with mechanics for fishing, cooking, Menko, homework, building relationships, avoiding detection, shrine donations, a fair amount of skills that aren't just sex animations, a working calendar and time system where each action and move you make costs time, and each day is broken up into segments, but unlike the first where it was just Morning/Noon/Evening/Night-
You still have those time blocks (here split into Morning/Noon/Dusk/Evening/Late Night), but each actually have a set amount of minutes in the day that they last for, so you can actually do more in a single time block than just one main action like it was for the previous game.
You also have multiple ways of leveling up and progressing, being able to unlock skills from making memories at the end of each day, and being able to increase your stamina, lust, money or memory points by leveling up AS you're doing activities each day.
Sure, a lot of the game is mini-games, but they're mini-games that actually have a meaningful impact in how you progress, which is pretty good, in a weird way, I'd almost compare this game to a lot of farming games? Games like Story of Seasons/Harvest Moon/Stardew Valley, but if all the farming were instead thrown out in favor of more focus on relationship building.
There's also achievements that each unlock new features and mechanics when you unlock them, like having tons of sex unlocks an achievement which grants the ability for you to be able to make a mess and not have it be found suspicious, or clean so many times that whenever you clean, it cleans the entire house all at once.
And all that is coming out of an RPGMaker game, an engine that's often used to not very good effect, or has to explicitly lean into a very specific style of game in order to be good, but here, it doesn't even look or play like RPGMaker, if I weren't explicitly told that was the engine by the tags, I never would've been able to tell and would've assumed that it's made in something like Ren'Py, or something completely different.
It seems as though the devs made this game from the ground up to be almost entirely original, and I respect it for that.
Overall, there's much I could say, except-
Women are for winter, but Menko is forever.
Believe in the power of friendship.