[Direct Order 直接注文]
You can order directly from the publisher Sokyu-sha. (See details below.)
Their shipping fee is FREE for domestic in Japan.
Tel: +81-3-3358-3974（everyday/1pm～7pm) *Some signed copies are available here.
Email to: firstname.lastname@example.org
They have a bookstore in Tokyo (Shinshin-building 3rd fl., Shinjuku 1-3-5, Shinjuku-ku). You can view the copy at their store. Or available at other bookstores.