| Mizuiro 2003 | |
| Ja Kanji: | みずいろ |
| Genre: | Romance |
| Type: | ova |
| Director: | Kiyotaka Isako |
| Studio: | NekoNeko Soft |
| Released: | 25 April 2003 |
| Episodes: | 2 |
is an anime OVA. It is a second, non-hentai adaptation of the game Mizuiro. The story was slightly changed, but it follows the main game's plot climaxes, focusing on Hiyori and Yuki scenarios. With this OVA, the omake "Selling Memorial Event" was released, which features the voice actors talking about their characters.
The protagonist, Kenji, is living with his adopted sister Yuki, who admires her older brother and harbors a slight secret crush on him. One day, after a certain night, a girl—Hiyori, their childhood friend—begin to appear in Kenji's closet. Moreover, her body is transparent, and she has gaps in her memory. As they struggle to figure out the mystery behind Hiyori's state, Kenji begins to realize his forgotten feelings and Yuki suffers with her secret.