This anime makes us realise the importance of friends and family in life. Having regrets is part of life, don't let it get to your heart. I won't ask you to yolo all the time but make sure to have no regrets when it comes to your family and friends. Spend time with them, shower all your affection and of course fight.
That's the message this anime tends to deliver I believe. And it's awesome! I wish my high school life was a bit more fun if I came out of my comfort zone a little