Kindergarten Wars manga volume 3 features story and art by You Chiba.

An assassin named Natasha, looking for an 'unbreakable toy,' has come to challenge Rita to a battle to the death to fulfill her desires. However, the other teachers of the Dandelion class are also caught in the crossfire of Natasha's onslaught! With her friends in grave danger, Rita's ruthless side as 'the Witch' reawakens!