Natsu ga Owaru made: Natsu no Owari The Animation (translated as Until the End of Summer: The End of Summer The Animation
If you enjoy:
Ultimately, the best series is a matter of personal preference. If you're looking for a thought-provoking drama with relatable characters, "Natsu no Owari" is the way to go. If you prefer a fast-paced adventure with a mix of action and fantasy, "Natsu ga Owari Made" is the better choice.