What is your go-to Anime whenever you want to feel cozy and warm inside? I loved Toradora back in the day, and I am trying to find other anime like it. I also watched Golden Time and Horimiya, and they were both good as well!
As someone already mentioned Mushishi; Natsume Yuujinchou is just so soft! I don't know how else to explain it.
I am old, so 2000s Fruits Basket, as well, mostly, as I actually finished it. I'm really attached to Ritsuko Okazaki's score. I haven't finished the recent series, but the 7 or so eps I've seen, made me super happy, as I wanted a series that adapted the full manga, and it nailed a lot of what I remembered.
OK, one more, as rereading your post reminded me of another romance series: Wotakoi! Sadly a short anime, but the manga has good feels, too.