beta
Don't like it, don't read it and they're only a few years apart. If you read Sasaki to Miyano, in the later chapters you could also say an adult is dating a high school student. The only reason why you don't put it like that is because they started dating a few months before Sasaki graduated. The age difference here is nearly the same as in Sasaki to Miyano, maybe one year more. So where is the problem?