When Kit left for a mission with Cuttlefish she didn’t think it would be long told Kat she was going off for a month to train and would be back. A month past then two, three, six and then a year passed and Kat grew up able to hold her kid form but her big sister wasn’t there to celebrate with her like planned.
Kat was worried and went looking in Kit’s bedroom for clues. She found notes Kit referring to herself as agent 3 and referencing an agent 1 and 2 and a Captain. Kat goes to Inkopolis to try and find more information leading her to become agent 4
Kit and Kat reunited at the end of the two story modes, both sisters felt a lot of emotions and Kit who isn’t one to hug; saw how her little sister was staring at her and knew she wanted and needed a hug from Kit. Kat felt so many things about seeing her big sister looking like she lost in a fight. Most of all she’s glad she’s safe.