I Don't Need a Rival - S1.E2

Two mysterious beings, a girl and a tiger like creature(who later transforms into a small cat), appear on Earth and both have the same mission, to get to Arcs. Then Ink gets a distress call and transforms outside of class. Sumi sees this happen. Then Pastel Ink and Arcs get stuck in Dream And Illusion Space also known as "DAIS", an alternate universe created with magic. The cat is revealed to be Kaksu, who was a colleague of Arcs from the Magical Kingdoms.