Nagihiko returns, much to Kukai's surprise. When Amu sees him, she is told that Nagihiko would be the new Jack's Chair.
Amu still believes Nagihiko is Nadeshiko's twin, even though they are one in the same. Rima is jealous and suspicious of Nagihiko, especially with his and Amu's friendship. Later, Amu is seeing hanging around Mamoru Mizuno who wishes to visit the town's Planetarium. Lulu notices this, so she plans to get to Mamoru after he leaves the Planetarium, but Amu sees her. Lulu brushes her off, angering Amu immensely. Mamoru later goes to the Guardians with his Heart's Egg turned into a Mystery Egg, and he Character Transforms to Space Dream. Amu Character Transforms to Amulet Heart. Thanks to the Humpty Lock; Tadase's, Rima's, Yaya's, and Kukai's transformations power-up. Using his powers, he lifts a lot of things off the ground. He tries to lift a rocket-style play set, but the Guardians hold it down. Amu gets roller skates, Heart Speeder, to chase after him. Eventually, Mamoru realizes he is in the wrong, changing his Mystery Egg into an X Egg. Amu then purifies the X Egg. ...もっと