I just don't know how people can get over how pathetic this kind of premise is. Even the fanservice doesn't seem appealing when it's from a perspective of "I wasted my whole life but was able to redo it and get luckier this time." And it's almost always luck. They don't magically become assertive or anything, they just happen to see their teacher naked or she happens to ask them out for no reason. Or if it's about classmates it's an old guy using his developed brain to manipulate young school girls, which is far creepier and I'd think it's nasty to anyone who isn't old as fuck themselves.