Story: It is a pretty basic premise: a loner boy with a fascination for designing Hina dolls, meets a gyaru who wanted him to make her a cosplay outfit of her favorite character from an eroge video game series. Besides that, I really love the interactions between the two main characters, and I find some of the information on clothing and textiles interesting. With both characters being so likable, you'd want them to both succeed in their goals.
As for fanservice. It's definitely there considering the premise, but I'm not really too bothered by it. In fact, the fanservice goes hand in hand with Marin: she is depicted as a free spirit who does not care what others think about her and demonstrates clearly her passion for what she loves. But I also love the show because of how Gojo feels like a fish out of water. You can easily tell he was never exposed to anything like anime or pop culture which makes Marin the perfect outlet for Gojo to see through. For a story about an eccentric girl gradually pulling a boy out of his comfort zone, I think it is purely wholesome.
Characters: The characters are portrayed as being people instead of filled with anime rom-com clichés. Gojo starts off as being awkward and introverted, but there is nothing creepy about it. On the contrary: Gojo is a very endearing character who at first did not want to be despised for his interest in Hina dolls due to some traumatizing experience from his past. Because of Marin, he is able to feel validated in what he loved and open up more. I also commend him for being a true goat when he thought that the deadline for Marin's outfit was coming soon. He can be very determined when he wants to be.
Marin, to be frank, is the main reason I can see why several people watched the anime. Far from being a stereotypically cruel popular girl, she is instead kind and understanding not to mention patient with Gojo even when he tried avoiding her in one episode. She was fascinated by Gojo's hobby rather than creeped out by it and is so contagiously optimistic and preppy, it will rub off on you.
Supporting characters are also pretty good for the most part. I love Gojo's Grandpa and his reactions are hilarious. Sajuna, another cosplayer who is Marin's idol, off the top of my head, I do not like her. She establishes herself as bratty and even resorts to trying to blackmail Gojo in order to get a cosplay outfit off him. Normally in a lot of these shows, what keeps them from being masterpieces to me is when a third wheel is introduced oftentimes to combat with the other potential love interest in a Betty v. Veronica fashion a cliché that is overused and should die in a fire.
Animation: I love the attention to detail when it comes to designing the clothes or gathering the materials needed. The shading is also vibrant and lovely. The only minor nitpick I had come with a frontal view of a character: they have a noticeable black spot in the middle of their face. It is there to represent the tip of the nose, obviously, but it is distracting.
Sound: The opening and ending themes are bops, and everyone does a good job with the material they are given.
Ultimately, if you like anime about cosplaying and cute character interactions, this could be a show for you.