This one slows the whole Anpanman machine down to the speed of light bending across a night sky. Ruby is not a cute sidekick, she is an Aurora Girl who got thrown out of her own country for being insufferable, and the first thing she does with Anpanman is lie straight to his face about why she needs the Aurora no Shizuku. The gag is that it does not matter. He helps her anyway, because that is what he is, and watching a selfish kid try to run a con on someone with zero suspicion in him is quietly devastating for a movie aimed at four-year-olds. Then Baikinman catches wind of three free wishes and the whole thing turns into a race. The aurora work is the reason to sit still for it, curtains of color doing more emotional lifting than any line of dialogue. You come for the bread hero, you stay because Ruby has to decide who she actually is.
Ruby falls from the Aurora Land where she's created northern lights with her kind. Kicked out for her selfish ways, she's given one condition for redemption: find the magical Aurora Drop, a stone that grants three wishes. When she crashes into Anpanman's world, she spins a lie about needing the stone to save her homeland, and the hero believes her completely. The problem deepens when Baikinman catches wind of the wishes and starts hunting for the stone himself. Ruby finds herself genuinely bonding with Anpanman and his friends, and suddenly her original goal feels complicated. She wants to go home and earn forgiveness, but not at the cost of betraying the people who've started to trust her. As Baikinman closes in with selfish intentions, Ruby faces a real choice: grab the stone and leave, or stand with her new friends and risk losing everything she came for. It's a story about learning that sometimes the people around you matter more than getting what you thought you needed.