So... is Mizuiro (2003) finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
Kenji lives with his younger sister-in-law, Yuki, while their parents are often away. Yuki harbors secret feelings for Kenji. One night, a girl named Hiyori mysteriously appears in Kenji's room. She's transparent and seems to be a ghost, and they discover she's an old childhood friend.
Kenji and Yuki are confused by Hiyori's sudden and strange reappearance. As Kenji and Hiyori reconnect and grow closer, Yuki struggles with her feelings for Kenji and painful memories from their childhood resurface.
A childhood promise involving a toy ring and a yoyo, and Hiyori's past illness, seems connected to her current ghostly form and presence. The story focuses on the complicated and emotional relationships between Kenji, Yuki, and Hiyori, exploring themes of love, loss, and unresolved feelings from the past.