The saddest part of this manga isn't the ending, it's the fact that someone is pathetic enough to write such a mediocre fantasy of their school days in the first place. "Getting hot and fucking every girl in class" is the type of dream you'll only hear from the abused kids in elementary school who are so starved for affection that they can't imagine any nuance to it. It's less surprising coming from this author, but genuinely, I don't think I could write a story more indicative of insecurity if I tried.