Natsume Yuujinchou

On a hot day at the end of summer, Natsume receives an “invitation” addressed to his grandmother Reiko, delivered from the shadows while walking home. Though unsure how to respond, he heads out river fishing with Nishimura and the others, only for Nyanko-sensei to suddenly appear there...!? (Source: Hakusensha, translated)

When Reiko was Takashi's age, she bound the names of demons and spirits in her Book of Friends, enslaving them to her capricious whim. Now Takashi is the owner of the book, and the creatures will do anything to get their names back. (Source: VIZ Media)