Aoi Hana~ Even the name is kind of sweet, although you can immediately tell the style of stuff if it has a 'hana' in it, since hana means flowers. So yes, this manga is a particularly gentle, soft-style, relaxed one. It epitomizes slice of life for me, and the writing is nice, where the characters develop and learn about themselves gradually. It has, as far as I've noticed, very few cliches in it (and before I am corrected, tropes are not always the same as cliches); so if you like clear cut and stereotype-ish things in your manga (I mean stereotype in the best possible connotation), this series will be somewhat difficult to follow. Notice how I also emphasize its slow, gentle nature.
This manga is very much a slow paced one, so if you're an action fan (like me!), a psychological manga fan (like me!), a horror fan (like me!), or a fantasy-sci-fi-otherworld-magic fan (like me!), it's not necessarily for you. But if you've got the patience inherent to people who read seinen seriess, or the love of something that really unfolds as it goes along, and holds unexpected, but gentle surprises, take a look at this one.