So... is Mitsudomoe finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: February 27, 2011
Manga finished: August 12, 2017
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.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Mitsudomoe
みつどもえ
Anime - Base
Release date: July 03, 2010
Mitsudomoe Zouryouchuu!
みつどもえ増量中！
Anime - Sequel
Release date: January 09, 2011
Synopsis
Mitsudomoe follows the chaotic life of Satoshi Yabe, a new elementary school teacher, after he's assigned to class 6-3.
His biggest challenge comes in the form of the Marui triplets: Mitsuba, the sadistic one; Futaba, the lewd and strong one; and Hitoha, the quiet and bookish one.
The sisters take a particular interest in Yabe, leading to a series of pranks, misunderstandings, and generally bizarre events that disrupt his normal teaching life.
The anime focuses on the daily comedic struggles of Yabe as he tries to manage the triplets and their eccentric classmates in a school environment that's anything but ordinary.