So... is Kobayashi ga Kawai sugite Tsurai!! finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: March 26, 2014
Manga finished: December 19, 2015
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
Kobayashi ga Kawai sugite Tsurai!! revolves around the mischievous plan of twin siblings, Megumu and Mitsuru Kobayashi, who are tired of their respective single-gender schools.
Driven by boredom, they decide to secretly swap places, attending each other's schools in disguise. This leads to unexpected challenges and romantic entanglements.
As Megumu navigates the boys' school and Mitsuru the girls' school, they both find themselves in situations that spark romantic feelings. However, their secret identities remain hidden, creating comedic and potentially complicated situations as they navigate these newfound affections.
The core of the story lies in the blossoming romances and the looming question of when, and how, their true identities will be revealed, promising a blend of comedy and romance.