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.
Even if my batteries died and I disappeared,
،حتَّى لو فَرُغَتْ بطّارياتي واختفَيت
Selbst wenn ich wegen leerer Batterien verschwunden wäre,
¡Aunque hubiera desaparecido 
por falta de energía,
Aunque hubiera desaparecido 
por falta de energía,
Même si je disparais
après avoir vidé ma pile,
Anche se mi fossi scaricata completamente,
Mesmo que minhas pilhas 
morram e eu desapareça,