First of, I do find it quite, a little, refreshing. And I love slow paced manga.
It's indeed rare to see quiet (meaning, really quiet, not exactly introverted, or maybe introverted and very quiet, with stressing on the quiet), expressionless, female lead in shoujo manga, meeting with a, also quiet but of more commonly quiet type, boy. Now you can imagine when both met on their way noticing each other or in some occasions, standing face to face, with no one else around. It's just the first volume, and I'm curious of how many silence sequences would appear in the following volumes.
Those scenes, are simply sweet.
When it happened, it's drawn like they are in their own world, some close up on their subtle, seemed expressionless, but blushing face, some are drawn within quite a large panel. The panels feel empty and muted but full of sweetness.
Now to the parts that I don't really like.
I'm honestly bothered by the fact that Suiren is the cutest, most beautiful, flawless, girl at school, no, in the world (maybe after Aphrodite). I won't be so bothered as it's kind of common in shoujo manga but when every panel where she's in the crowd or if there is one guy around her, he/they'll blush or say how cute, how beautiful, how she's so out of reach that she's called Takane.
Another thing would be the occasions where the main characters are having a conversation or meeting with each other are very repetitive, it's like their activities at school are only having a Karate club and having their lunch break (even when they're shown to be in the middle of a school trip).
I have a mixed feeling about this manga.
While it feels like having many repetitive storyline (and settings), it has those sweet moments in every ending of each chapter. I'm also wondering if the story would make any progress even after considering the slow pace. And the problem in every very obviously decided main couple (the rival girl is rather useless in my honest opinion), what story to tell after both are dating, I imagine an awkward but stagnant nonetheless storyline.