Yamada-Kun and the Seven Witches Vol. 17-18 (manga)

Suzaku High School is in crisis after a new witch power influences the student body to turn on the Student Council! Facing this and a mysterious threat from the Shogi Club, the gang must come up with a plan for a new presidential election. Meanwhile, Yamada and Tamaki track down Ichijo, the opposition for the upcoming election and wielder of a new witch power, but when they reach him, they discover him waiting ominously outside of Shiraishi's house...