Hobonichi Techo Weeks - White Line: Black (April Start)

The straight, white line is a trademark of the Weeks, and has been
used in its design since its first appearance. The soft cover makes
for easy page-turning, and it won’t get in the way, even if you
shove it in your pocket. Its strength lies in the fact that it can be
handled roughly. The softcover book is easy to squeeze in your
hand.