12 manga volumes appeared on Nielsen BookScan’s Top 20 selling graphic novel list for May 2017:

• Dragon Ball Super Volume 1 by Toyotarō and Akira Toriyama (#2)
• My Hero Academia Volume 8 by Kōhei Horikoshi (#4)
• The Legend of Zelda: Legendary Edition Volume 4 by Akira Himekawa (#6)
• Attack on Titan Volume 21 by Hajime Isayama (#9)
• Boruto Volume 1 by Ukyō Kodachi and Mikie Ikemoto (#11)
• Tokyo Ghoul Volume 12 by Sui Ishida (#13)
• The Legend of Zelda: Twilight Princess Volume 1 by Akira Himekawa (#14)
• Tokyo Ghoul Volume 1 by Sui Ishida (#15)
• Monster Musume Volume 11 by OKAYADO (#16)
• The Legend of Zelda: Legendary Edition Volume 3 by Akira Himekawa (#17)
• One Piece Volume 82 by Eiichiro Oda (#18)
• JoJo’s Bizarre Adventure Part 3: Stardust Crusaders Volume 3 by Hirohiko Araki (#19)

Source: ANN