Midori Days (美鳥の日々 Midori no Hibi, Days of Midori or Midori's Days) is an 85-chapter manga and 13-episode anime series created by Kazurou Inoue (井上和郎 Inoue Kazuro). The title is a pun referring to Greenery Day (みどりの日 Midori no hi), a Japanese holiday formerly part of Golden Week (Japan).

The manga was published in the magazine Shonen Sunday until July 2004, while the anime series aired between April and June 2004 in Japan on the anime television network, Animax, who have also broadcast the series across its networks worldwide, including Southeast Asia, East Asia, South Asia, Latin America and other regions. Studio Pierrot was the animation studio for the TV series. Media Blasters holds the North American license for the TV series, and VIZ Media licensed the manga in English in North America. Chuang Yi publishes the manga in Singapore in English.

Seiji Sawamura is the toughest student in his high school. His grades aren't very good because he fights more than he studies, but he tends to protect the weaker students from bullies. A few classmates idolize him; one (Midori Kasugano) shyly loves him from afar; but most are just afraid of him, which has made it impossible for him to find a girlfriend—until one morning when he wakes to find a miniature Midori attached to him where his right hand used to be.

Over the next two weeks the pair adapt to this sudden and forced closeness. Much mayhem, and some romance, ensue. Seiji does his best to hide Midori from other people; she wears a bandage around her head and pretends to be his injured hand. Midori frequently professes her love to Seiji (even wearing a T-shirt which says "I ♥ Seiji"), but Seiji fails to notice, even as he frequently laments that he'll never find a girl who loves him.

The anime is shounen, with tasteful nudity and occasional (and lingering) views of bare breasts. The connection between Midori and Seiji appears to be between her waist and his wrist, but it is never shown (he always wears long sleeves, and she usually wears a dress) nor explained.