On a drizzley morning, Miss Monochrome wakes up in her four and a half tatami-mat sized apartment. When she tries to change her battery, a leak in her roof causes her battery box to explode. What should appear from the smoke of the explosion but a good-looking guy in the form of a battery! Miss Monochrome and Battery-kun are shocked by this destined encounter. Thus begins their days of friendship.
Oh, that battery! It would fit you perfectly!
تِلك البطّارية! ستُلائمكِ تماماً
Oh, diese Batterie!
Sie würde sicher zu dir passen!
¡Vaya, esa batería es perfecta para ti!
Vaya, esa batería es perfecta para ti.
Cette pile t’irait à merveille,
tu ne trouves pas ?
Oh, quella pila! Ti starebbe benissimo.
Ah, aquela pilha! Cairia 
com perfeição em você!