A lot of these negative reviews here are not about the plot but rather about their own views on the "is sex in high school bad?" dilemma.
Reviews should be about the TV show, not about whatever you think is morally correct or not. So for those who want a quick review regarding the quality of the actual TV show, read below.
It shows how teenage students in a private high school in Japan tackle with a no-romance rule that is imposed by the principal. It is emotional and shows different variations of love and heartbreak and the different ways people cope with these feelings, a bit of diversity if you will. I thought that it portrayed quite a realistic view of how japanese people think of love and expressing feelings.
The cinematics were very eye pleasing, a 9/10. Lots of romance scenes had beautiful, mesmerising set ups, very beautiful cinematography and I cannot praise it enough.
Up until the last 2 episodes it was very exciting to watch. The last episode felt a bit unrealistic, maybe a bit rushed. The last episode had quite a lot going on, and I think it could've been prolonged to 12 episodes instead, to ease the unevenly rushed final episode. It was of course left open for a potential second season and had (in my opinion) an interesting twist to a twist if you would.
Would I recommend it? Yes. It tugged at my heartstrings, though I am maybe a bit too emotional. If you're looking for a TV show to binge at night and want to cry a bit, it is definitely for you.
Did it have flaws? Yes. Did I enjoy it? Also yes. That's why I give it a 8/10.