Two weeks before the theatrical release of the feature film adaptation of Kengo Hanazawa's zombie survival manga I am a HERO in Japan, NTT DoCoMo's online-video service dTV will start streaming its prequel web drama I am a HERO: Hajimari no Hi. The story of the web drama will focus on the nurse Tsugumi "Yabu" Oda. Through her experience as a nurse, the web drama explains how the zombie pandemic spreads across Japan.

Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.