So... is Kemeko Deluxe! finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: December 21, 2008
Manga finished: June 27, 2011
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
Kemeko Deluxe! centers around Sanpeita Kobayashi, a high schooler eagerly anticipating the reunion with his childhood sweetheart who promised to marry him after ten years.
His ordinary life is thrown into chaos when a strange, powerful robot crashes into his room, piloted by a girl claiming to be his future wife.
Sanpeita is left bewildered, grappling with the identity of this robot pilot and the mystery surrounding his long-lost friend's sudden reappearance in such an unusual form.
The story follows Sanpeita as he tries to uncover the truth behind the robot, the girl's connection to his past, and her potential involvement with a powerful corporation, all while navigating the bizarre circumstances of their reunion.