Maxim defeats who he believes is the leader of the Sinistrals, and his group thinks they've saved the world. There's a timeskip and Maxim marries Selan, and together they have a son. Not long after, their son is kidnapped and they find the culprit works for the Sinistrals, who are still alive. Skip to the final confrontation with Daos, the main Sinistral:
Most of the good stuff is in Part 1. Part 2 is worth watching too, though.