It's not often you see a manga with almost all the main characters in their 30's, dealing with real adult issues with realistic reactions. The female characters are multi-dimensional, complex, and although they are friends with similarities, they all have distinct personalities, tastes, beliefs, and flirtation styles/ways to pursue romance. I mention this because this is a rom-com, and generally speaking, slice-of-life rom-coms have female characters who are simple and are more a passive receiver of romance, instead of being the one who pursues or struggles with problems that might arise when you're the target of one's affections.
Romance doesn't come easy for these characters, their relationships are difficult or complicated, and the friendship the girls have with each other is inspiring, relatable, hilarious, and down to earth. I've never laughed out loud reading so many times before. There are moments between the characters that are so surprising that my jaw drops, and I hide my face with the book. Some events in the story conjure such strong emotions, like 2nd hand embarrassment, heartbreak, bewilderment, or just plain joy for another character's happiness that you might find yourself expressing it outwardly in the same way I did, hiding my face with the book if in public.
There are sex scenes in this book but nothing on a hentai-level, more romantic illustrations where you don't see anything explicit. Lots of luxury drapes of textile-adorned clothes, plush blankets, twitterpated embraces and face-closeups with such amazing art style and skill that even the most frigid reader might find their heart a-flutter. The way Akiko Higashimura illustrates expressions is moving, and she backdrops these character's intimate moments in synergistic settings, from infatuated bath house encounters, lovely top-floor rooms with twinkling skylines, to frustrated group visits to shut-in spas, gossip filled brunch cafes, and so much more. It's so easy to get lost in this series, it is hands-down the best slice-of-life rom-com I've ever read. It isn't always a comedy, it isn't bombastic or silly. The comedy is very mature and sophisticated, and well spaced out.

TL;DR, read this if you love slice-of-life or rom-coms. This series is more suspense-romance than it is comedy.