Ecchi is a slang term in the Japanese language for playfully sexual actions. As an adjective, it is used with the meaning of "sexy", "dirty" or "naughty"; as a verb, ecchi suru means "to have sex", and as a noun, it is used to describe someone of lascivious behavior. It is softer than the Japanese word ero, and does not imply perversion in the way hentai does.

Shōnen manga is an editorial category of Japanese comics targeting an audience of adolescent boys. It is, along with shōjo manga, seinen manga, and josei manga, one of the primary editorial categories of manga. Shōnen manga is traditionally published in dedicated manga magazines that exclusively target the shōnen demographic group.