Yamada-kun and the Seven Witches 9

Kiss and Wake up Yamada has managed to find the seventh witch and protect Shiraishi, but the final witch's memoryerasing powers have a troubling effect on the Supernatural Studies Club. Facing a world where his friends don't remember him, Yamada and Tamaki discover that to solve their problems, they need to go back to basics: kissing! Using his dupication powers and the help of a few unlikely allies, he may be able to restore what he's lost…but his plans to outwit the seventh witch's power don't go unnoticed by the crafty Student Council.

Volume 9 of the Yamada-kun and the Seven Witches manga series by Miki Yoshikawa.