Sousou no Frieren/Anime.

After defeating the Demon King, the hero Himmel's squad returned home. A decade-long adventure had come to an end. The elf sorceress Friren and her brave comrades brought peace to the people and went in different directions to live the rest of their lives in peace. However, not all members of the squad will suffer the same fate. For the elves, time flows differently, so Friren is forced to witness how her companions one by one gradually pass away. The girl realizes that the years spent in the hero's squad flew by in an instant, like a shooting star in the vast cosmos of her life, and is faced with regrets about missed opportunities. Can she come to terms with the death of her friends and realize what life means to those around her? Friren begins a new journey to find the answer.