One day, Kon, desiring to become a stronger familiar, transforms into a human form and ventures off into town. There, she encounters Kōji's younger brother, Shiro, who had run away from home after getting into an argument with Kōji, who told him he couldn't play fireworks with their mother because of her work. Kon ends up having to put up with Shiro's selfishness, until they are both found by Inari, who had heard about the situation from Kōji. After quickly deducing Kon's identity, Inari accompanies Shiro to the supermarket where his mother works, with Shiro becoming upset when he sees her mother being busy and running off yet again. Wanting to defuse the situation, Inari transforms into Shiro's mother and offers to play with fireworks with him and Kōji, only to find the reason he was crying because he realised he was bothering his mother at work. In the end, Shiro plays fireworks with Kōji and Inari, before their mother manages to sort out a shift change to spend some time with them, whilst Kon learns something from her experience.