why every chapter being labeled mature when there are no mature scenes, just say official ...

because there's 2 official version. Mature and all ages

The first official is censored, that's why this second one said matured because the kiss & sex scenes won't be edited.

There's differencd between all ages and mature version it's not all about sex it's about their convo how all age version cutted off and played with dialogues to make it childish meanwhile mature version dialogues are more detailed in their scene