Really funny story about a teenager who joined the diving club and starts to learn the joys of the world underwater.
Nah, just kidding. This premise is just a plot-point that comes up whenever the manga needs a story to follow.
The real charm of this book is its comedy. These characters are all likable and a ton of fun to follow. The overly detailed artwork brings a tone of seriousness to the story that just makes all the jokes feel even more dramatic.
I recommend reading the first three of four chapters and seeing if the humor appeals to your taste.