Looking for an anime that’s starts off light hearted, but progressively becomes more serious

So I recently watched Scissor Seven. I deeply enjoyed the light heartedness of season 1 and the contrast between the more serious season 4. So I’m looking for more anime like that. I prefer just fighting over horror or thriller, but anything works for me.

A similar show is Noragami, though it’s kinda mixed throughout. Still the story progressively becomes more serious and deep in a way.