Natsume Yuujinchou

I forgot where I saw the rec, but I just finished watching all four seasons of "Natsume's Book of Friends", or "Natsume Yuujinchou." I loved it. It's about a boy who can see spirits, or youkai. He's moved in with a new foster family and is very lonely at first, but he acquires a youkai "bodyguard" and slowly makes human and youkai friends and becomes closer with his new family and it's all beautiful to see. There are a lot of "youkai of the week" storylines, and he eventually meets other people who know about youkai too. He also received a heavy legacy from his grandmother: a book with many youkais' true names, which he could use to control them, but instead he gives the names back.
The anime feels a bit slow at times (maybe just because I'm sometimes impatient), but it's very warm and nice.

( Spoilers, non-ordered thoughts about many characters )

I'm going to request this fandom for Yuletide, I already have fic prompts to use.

Season five comes out soon! I'm very much looking forward to it :)