Yamada-Kun and the Seven Witches, Vol. 13 (山田くんと7人の魔女 / Yamada-kun to shichinin no majo #13)

After helping new witch Kanno control her powers, Yamada and the student council are on the lookout for the next generation of witches. Punk second-year students, Sid and Nancy, get in Yamada's way, but there's more to them than meets the eye. Nancy seems to know Yamada from somewhere, and she may have inherited the most dangerous witch power of all! Then, Yamada must also investigate the shy Kotori Moegi, a strange girl who has an entire class under her spell. However, when Yamada tries to learn her secrets, he has his own brush with overwhelming power! To ease his mind, he'll have to seek out another power, and the entire student council may be on the verge of a shocking discovery about the rules of the witches…