Sakurako is a baby lesbian, 14-15 in age, who is about to start high school. Her new school is an exclusive boarding school, so she has to get a room at the boarding house associated to the school. The house is set up for two people to a room, and Sakurako has yet to meet her new roommate. Then, the girl arrives... and Sakurako can't believe her eyes: she's an ABSOLUTE GODDESS! A stunning blonde beauty with the body of a supermodel, big firm boobs, flawlessly fair skin, perfect shapely legs, a sexy round butt and a face so pretty it's breathtaking! And yes, she's only 15, just like Sakurako. Our poor Sakurako is so stupefied she even wonders if they are the same species! Like, she's Homo Sapiens Sapiens, but Kasumi (that's her roommate's name) must be Homo Perfectis Divinis or something! Oh, and the first thing Kasumi does after entering their room is stripping to her panties and laying down on the tatami mats in a lazy, sexy pose... which doesn't exactly help Sakurako recover from her state of awed wonderment, lol.
As usual in Japan, their room comes empty; they are expected to bring the furniture and everything else themselves. So they go shopping for all the stuff they need. They are going to live for the next three years in that shared room, so there's a lot to buy! At the tableware department, Sakurako says they should get matching mugs with a heart design on the side (the sort of mugs typically used by lovers and newlyweds), then she goes: "Haha, just kidding, that was a joke!" But Kasumi says: "Sure, okay, let's buy that." That leaves Sakurako speechless, wondering if she really is reading right the signals Kasumi seems to be sending her. Then, at the bedding department, they face a dilemma: the room is too small for two beds, but Kasumi doesn't want to use futons. Sakurako says: "I know! I'll get a single bed, and you can sleep with me! Hahaha, a joke, that was just a joke; of course you wouldn't..." And Kasumi replies: "Good idea. We'll do just that." And Sakurako looks at her in utter astonishment, wondering if she's dreaming, feeling like she can't believe her good luck... because, after a statement like that, there's no more room for doubt and no more chance of misunderstanding: yes, Kasumi feels for her the same way she feels for Kasumi; yes, this amazing blonde goddess actually likes her and wants to have THAT kind of relationship with her!!!
This is a simple lesbian wish-fulfillment story focused on Sakurako and mostly told from her point of view. Of course, we get to see through Kasumi's eyes from time to time, but pretty much every chapter is about Sakurako doing everything she can to make Kasumi happy (which is often a heap of work, as Kasumi can be high-maintenance a lot of the time) and being rewarded with Kasumi's sweet love.
A lesbian fantasy with focus on Sakurako, who is living the lesbian dream life with an incredible beautiful partner who loves her for being honest, kind, sincere, a hard worker and a good cook. This is what it's been all about since chapter one when they became, not just a dating couple, but a couple living together in "a room for two" with one single bed. That I think is the accurate-est answer to the point in question.