i-plug, Inc. engages in the human resources (HR) platform business. It develops and offers career database platform through their products: OfferBox and eF-1G. OfferBox is an HR platform that provides new graduate direct recruitment services. eF-1G provides aptitude test service before and after joining a company. The company was founded by Tomoya Nakano, Masahiro Yamada and Nobuaki Tanaka on April 18, 2012 and is headquartered in Osaka, Japan.