Looking for an anime with the same vibe as The Last of Us

Hey everyone,

I'm looking for an anime that captures a similar vibe and emotional depth as The Last of Us. Specifically, I'm drawn to stories that include:

A post-apocalyptic or dark world

A strong bond between two main characters (preferably an older/mentor figure and a younger person)

Friendship or emotional connection that gradually builds through shared struggles

A focus on character development and emotional storytelling

A gritty, sometimes harsh atmosphere

Themes like loss, survival, humanity, and moral grey areas

I really love stories where characters grow closer over time through the hardships they face together.

If any anime comes to mind that fits this, I'd love to hear your recommendations!

Thanks in advance!