While Ichigo Momomiya is on her first date with Masaya Aoyama, she is bathed in a strange light and sees herself being merged with a cat. Afterwards, she begins to display cat-like behaviors. The next day, Ichigo follows Masaya into a park, where a strange jellyfish-like creature takes over a rat's body, turning it into a monster. Ryou Shirogane saves Ichigo and gives her a pendant allowing her to transform into Mew Ichigo. With her new powers, she defeats the monster, turning it back into a normal rat. Afterwards, Ryou refuses to explain what just occurred, so the newly arrived Keiichiro Akasaka offers to do so instead.

While cleaning the café, a woman approaches Ichigo and Lettuce and begins speaking to them in English (Spanish in the 4Kids dub), but they cannot understand her. Masaya appears and translates for them. The woman, Mary McGuire (Maria Rivera in the 4Kids Dub), is a pianist who Ryou asked for a performance at an upcoming formal party to reward the girls for their good work. During the party, Kish appears and uses a new technique to steal Mary's (Maria's) spirit to create a chimera anima. During the battle, he mentions the name of the mysterious alien leader, Deep Blue. The girls use Mary's (Maria's) music to weaken the monster, enabling the girls to defeat it and return her spirit back to her body.

The group is searching for mew aqua around a large rock formation in the forest when the girls and Masaya get separated. Something strange begins happening and everyone transforms. Masaya transforms into the Blue Knight, but falls from the rock and returns to normal. Kish confronts him and reveals that he cannot maintain his Blue Knight form if he is not protecting Ichigo. The alien moves to kill Masaya, but Mew Ichigo transports and appears between them. Masaya is knocked unconscious as Kish tries to kill Ichigo. This triggers Masaya's transformation, but his powers go out of control due to his rage at Kish. The other Mew Mews teleport to Mew Ichigo just in time to put up a shield around her as the rock explodes from the Blue Knight's power. Masaya returns to normal, seemingly unharmed. Kish tells Pie and Tart that the Blue Knight is the one who can save them.

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