Takashi Natsume has grown accustomed to his encounters with youkai through the Book of Friends, which contains the names of youkai whom his grandmother, Reiko Natsume, has sealed in contracts. These encounters allow Natsume to better understand the youkai, Reiko, and himself.

The Book of Friends is a powerful tool that can be used to control youkai; it is sought after by both youkai and exorcists alike. Natsume just wants to live out his daily life in peace but is constantly disrupted by these experiences. If he is to end this torment, Natsume must explore more about the book and the world of exorcism, as well as begin to open his heart to those who can help him.

4期にわたり放映されたアニメ『夏目友人帳』の完全新作OVA。妖怪を見ることができる夏目貴志が、自称用心棒の妖怪・ニャンコ先生と共に妖怪たちと交流する様を描く。

收录于BD&DVD第5卷中。

第5期Blu-ray/DVDに収録の新作エピソード。それぞれ前編・後編と、連続したエピソードとなっている。
脚本 吉永亜矢
絵コンテ 寺東克己
演出 小林孝志
作画監督 川添政和、伊藤秀樹、宗崎暢芳、青野厚司、合田真さ美
総作画監督 伊藤秀樹