Yamada-kun and the Seven Witches, Volume 9

Kiss and Wake up
Yamada has managed to find the seventh witch and protect Shiraishi, but the final witch's memory-erasing 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 powe...