Yep - heartwarming in a lighthearted way is a good way to describe K-On imo. But for me the thing that stood out the most in K-On was the outright buffoonery and silliness that they indulged in when around each other - one of the qualities that certainly characterized my group of friends in my hs years and even today, some 25 years later or so.
To be fair this is certainly not everyone's experience, but it certainly IS an experience that not a few people have been having through the centuries, whether one likes or has experienced it themselves or not.
