Can I get a overview of this please? Sad ending??

The first season is sad and horrific and a rlly hard read, the last two are happier, but the events of the first season still weigh pretty heavily on the reader I feel

So the next seasons are the continuation of the 1st season?

Technically yeah it’s continuous, like it’s the same main characters and conflicts, but s2 and 3 are a lot diff from s1 due to smth that is a spoiler