Does the world really need another manga about the husbandry of yôkai, those mischievous, minor demons that populate Japanese folklore? Is there room for more adolescents who can see these creatures and seem fated to interact with them? Sure we do, and sure there is, if the stories are good and the adolescents are interesting and sympathetic. Both are true of Natsume’s Book of Friends (Viz), written and illustrated by Yuki Midorikawa.