This is a mediocre manga in all aspects. And definitely does not belong in Seinen.
On the good side it's light and actually had a few jokes i really laughed at, which doesn't happen that often. It's about sports and that's always a good subject with a lot of promise.
On the bad side i didn't buy the characters, they had backgrounds, they had personalities, i just didn't care for them, for some reason. This just show that if you have a long manga and time to build a character, you don't necessarily know how to.
Another minus was the kendo. So yeah, LOL, the sport this manga is based on. I'm tempted to say kendo is a boring sport. But i really enjoyed manga about Go, and baseball, and running, and so on, so i'm sure kendo is not a boring sport, but the manga left me with this feeling anyway.
While the fighting scenes were nicely drawn, i couldn't feel and see the moves. There was also close to zero tactics and by the end of the manga we get to a "naruto" zone where people start acting like they can teleport and other ridiculous things like this out of the boundaries of real sports.
But overall this manga just didn't stand as something i would want to read again. It's the kind of manga i won't remember much from in a year. I can't think of any reason why i would recommend this to someone.