
1. They're children, already an established point
2.
3. Legal age does not mean that it is okay, just means that they are able to give consent when consent is needed
4. Even with that argument, they are not 13.
5. Highschool in japan starts at age 14. Given the mc's reaction to the girls in bikinis in this chapter, she and her classmates are clearly not in highschool therefore not 14 and likely not 13 either.
He's like edward and jacob in one