Natsume's Book of Friends (Seasons 1–7)

Natsume's Book of Friends (2008) is a supernatural anime you can watch online on iFILM. High schooler Takashi Natsume has always seen spirits, and he has always kept quiet about it — the gift he inherited from his grandmother Reiko brought him nothing but trouble growing up.

Then Reiko's old notebook lands in his hands. The "Book of Friends" holds the names of yokai she once defeated and bound to her will, and whoever owns it controls them. Plenty of spirits want it back by force. Natsume picks a gentler path: he returns each name to its owner, releasing the spirits one by one. Guarding him is Madara, a powerful beast stuck in the body of a pudgy cat — Natsume just calls him Nyanko-sensei. Hiroshi Kamiya voices the boy; Kazuhiko Inoue gives the cat his grumble.

Based on Yuki Midorikawa's manga, the show turns a premise about monsters into something quiet and kind: most episodes are a single encounter, each with its own ache and its own warmth. It has run for several seasons and still finds new fans. Stream Natsume's Book of Friends online on iFILM.