Wakaba-iro no Quartet is the latest mimikko VN from Lump of Sugar, a company that has a huge variance in quality from game to game (kamige one time, kusoge the next, lol). Lump of Sugar has of late mostly been doing mimikko games, with the Tayutama sequels/FDs and now two newer IPs having come out in the last four years. Since I love mimikko (it was my first fetish) this is a happy thing for me.
In the setting of this game, the mimikko come from an isolated mountain nation and are basically considered a genetic variant of humanity that has the ability to transform into animals. The protagonist of this story, Yuuto is a normal (think standard-issue VN protagonist) perverted young man who lives in an outwardly run-down dorm (inside it is modern and well upkept) with his osananajimi/childhood friend Miyako and his cat (who later turns out to be a mimikko) named Ai. However, things change for him when a young princess from the mimikko nation named Sophia transfers into his school and a girl named Hiyori confesses her love for him and asks to become his maid at the same time (yes, that was a wtf moment, but it was funny). Soon after, Sophia comes to live at the dorm (right after Hiyori does) and Ai is outed as a human being, resulting in all four heroines living under the same roof with the protagonist.
Now, I'm going to say this straight up... I never had any intention of playing the non-mimikko routes in this game. I like Miyako and Hiyori, but my love of mimikko means that they could only disappoint in comparison, even if their routes were better, lol.
The common route of this game is the usual LoS mix of cute and mild hilarity (Ai is probably the single cutest thing in the entire VN), and it is also the part of the game I had the most fun with. It isn't terribly long, but it doesn't really need to be. In it, there are some issues that come up and are resolved, giving you a solid idea of the character and personality of the heroines before you are presented with a straightforward choice of which route you go to (no other choices, yay!).
I went for Ai first, simply because Ai is so cat-like after nearly twenty years solely in her cat form that, as a cat person, I couldn't do anything else. Since I just told you she is definitely cat-like, anyone who has ever lived with a cat has a basic grasp of her personality (lazy, imperious, etc).
Ai's path is a pretty straightforward sibling-like relationship transforming into lovers path (think one of those paths where cousins live together and suddenly fall in love with one another one day), with a few twists due to Ai's past and a rather startling revelation about her origins. Since this was a straight-out charage, there are no dark parts to this story, but the ending is cute and a years-later epilogue, so I was satisfied.
Sophia is outwardly very princess/ojousama-like, but her basic personality is that of a future NEET (lazy, hedonistic, etc). Or at least, that is how they portray her in the common route. However, in her own route, her negative (not negative to me, negative in the context of the story) qualities don't come out that often... which surprised me, because her personality would have provided an endless potential for gags, even moreso than Ai's cat-like behavior.
Romance-wise, the path is very much standard vanilla fare. Don't expect any surprises, because there aren't any, really. There is some decent ichaicha, but nothing excessively cute, nor is there a huge amount of meaningless dating. That said, for being vanilla fare, it is well-paced and doesn't become boring.
There is some drama to the path, but it is resolved relatively easily (though not quite as easily as in Ai's path). I honestly felt that more detail could have gone into some aspects of the drama if they reworked things a bit (and I am half-sure an FD with an Aria path will pop up at some point), but, similar to Ai's path, I was happy with the ending and epilogue, which is rare in and of itself (though LoS is better about epilogues and endings than most charage/moege companies).
Despite being a fetish-ge for mimikko-lovers, this is a decent charage, though not one that reaches the highest tiers. I don't think I would recommend it above all the other mimikko-focused games out there, but it is definitely worth a play if you've exhausted all the other mimikko fetish games.