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This is a weird one... Kasane, an OL (office lady), falls in love w/ Meguru, a waitress at a restaurant she frequents. After discovering the waitress is in high school, they agree to be contractual sisters, with a bare minimum of questions (and clearly both with ulterior motives). It's only in the last chapter that someone finally starts asking the right questions! Setting the adult & high school student age gap aside, there's one clear red flag that I'm guessing will cause some drama in volume or two.
Anyway the book basically consists of the Kasane & Meguru spending time together, or Kasane daydreaming about Meguru (with the occasional self-reminder of "oh wait, she's a high school student, what am I thinking?!")... she does this both when Meguru's not around, and when they're together - so sometimes it's hard to tell which is which. Overall I enjoyed it enough to keep reading, but there isn't anything particularly interesting to it yet.
Language-wise, I think the L25 rating is a bit high, even with the lack of furigana. I certainly had a much easier time with this than say ホリミヤ | L25 (has furigana) or NEW GAME! | L25 (no furigana).