So... is Oniichan wa Oshimai! finished or not?
NO, it is not finished.
Why?
We found unfinished core content:
Oniichan wa oshimai! (Adaptation)
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
Oniichan wa Oshimai! centers around Mahiro, a NEET (Not in Education, Employment, or Training) who spends his days isolated and indulging in escapism.
His younger sister, Mihari, a gifted and caring individual, becomes concerned about his reclusive lifestyle and takes it upon herself to bring him back into society.
Mihari's unconventional approach involves a drastic experiment that unexpectedly transforms Mahiro into a girl.
Now, Mahiro must navigate the challenges of daily life as a young woman, dealing with the physical and social changes that come with his new identity, while also trying to understand how to reverse the effects of his sister's experiment.
The anime explores his struggles and experiences as he adapts to this unexpected situation, offering a comedic and potentially heartwarming look at self-discovery and family dynamics.