Himawari-san is a pleasant, laid-back slice-of-life series about Matsuri, a high school girl who has an undisguised crush on the owner of the old-fashioned Himawari ("Sunflower") bookshop located across the road from her school. Everyone in town nicknames Himawari's owner "Himawari-san" after her shop. Himawari-san is a little gruff, but genuinely cares about her customers (who like her quite a bit in turn) and comes to have a soft spot for Matsuri- but not in a romantic sense, Matsuri's age being what it is.
Like many a manga heroine, Matsuri is cheerful and good-hearted but none too bright, so when she studied for her high school entrance exams, no one gave her much encouragement. Himawari-san believed in her, however, and that was the start of her crush.
Himawari-san helps a few other customers out with their problems in this volume- including Matsuri's younger sister Fuuko, who, amusingly, develops a crush on Himawari-san also, although she's slow to admit it since she was initially kind of a jerk to Himawari-san. My favorite chapter is the Jinbocho chapter, since it perfectly captures the appeal of browsing the stacks at a bookstore, especially when you find a book that unexpectedly captures your fancy.
It turns out that Himawari-san's older brother Kuroizato-sensei, who kind of reminds me of Fruits Basket's Shigure, is a light novel author, and there's a rift between him and Himawari-san. Matsuri pieces together the misunderstanding between them after reading his latest novel and, in a nice example of things coming full-circle, helps them patch things up.
So, like I said, this is a pleasant, pick-me-up kind of series. You're going to be disappointed if you go into it for the yuri (which I didn't, although I liked how no one reacts to Matsuri's obvious crush on Himawari any differently than they would to a teenaged girl who has an obvious one-sided crush on a guy), but if you're looking for a yuri-friendly slice-of-life with likeable characters and no fanservice, this is a solid pick.
As a bonus for folks learning Japanese, like Sasameki Koto, this series is chock full of furigana, so it's easy to read for a seinen series.
Story: B (But B+ for the Jinbocho chapter.)