Zazan! A Tear is the World's Smallest Ocean Meow!

Siren, now known as Eren, continues to reject Hibiki and Kanade's offer of friendship as she is still unable to forgive herself. She encounters a boy named Mamoru who is hiding from his father. He explains that he ran off with his bag after hearing he was going to work abroad for a year. As Hibiki and Kanade have conflicting ideals to Eren, they go to search for the father whilst Eren leaves with Mamoru. Mamoru soon discovers a stuffed animal inside the bag that his father made him and decides he wants to return, helping Eren realise she's not alone as well. However, just as father and son are reunited, Bassdrum spots a Note inside the doll and creates a Negatone from it. As Bassdrum tries to waver Eren's feelings, Hummy helps her build up the courage to join in the fight as a Pretty Cure. After defeating the Negatone, Eren overcomes her worries and officially joins the Pretty Cures.