This is the first collection of decision-making works to commemorate the 35th anniversary of the debut of the illustrator of the picture book "Waniwani" series and "Mao Cat." It introduces more than 200 works, ranging from large-scale to three-dimensional works, picture books, posters, miscellaneous goods, and childhood works. There are many short essay-style sentences written by the artist himself at the time of creation, and you can look at the paintings and see Yamaguchi's worldview. In addition to talks with art director Kaoru Kasai, 20 artists, including Shuntaro Tanigawa, Hiromi Kawakami, Natsuki Ikezawa, and Yoko Gun, have their own theories about Yamaguchi Mao. It is also fun to hear stories about Yamaguchi from gallery owners who have held many exhibitions. It is a faithful book that can be accepted by a wide fan base.