Manga de Wakaru Denki Kairo

Also known as: マンガでわかる電気回路, The Manga Guide to Electric Circuit

by Yoshikazu Iida, Gareki Yamada

A couple of characters from a parallel world, Fuse and Cosmo, gradually raise their level by challenging them with problems on various electrical circuits, from direct and alternating current to electricity generation and transmission. (Source: DMK Press, translated)