Finished
“Boy discovers his new stepsister is his strict PE teacher, who becomes clumsy and kind at home.”
Ano Oni Kyoushi ga Boku no Ane ni Naru n desu ka?
あの鬼教師が僕の姉になるんですか？
6.36
19,565 rank · 7,950 readers · 33 favorites
Shounen
Comedy
Romance
Ecchi
Would You Love or Hate This?
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Based on your preference for character-driven stories with layered emotional arcs, this title's exploration of identity and belonging would deeply resonate. The pacing mirrors series you've rated highly, and its thematic depth aligns with your appreciation for nuanced storytelling...
However, the slow initial episodes might test your patience given your history of dropping shows that don't hook you early. The art style shift in the middle arc could also be a concern...
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Synopsis
Boy discovers his new stepsister is his strict PE teacher, who becomes clumsy and kind at home.
Ano Oni Kyoushi ga Boku no Ane ni Naru n desu ka? centers on a boy who is initially overjoyed at the news of him having an older sister due to his father remarrying to a woman who has a daughter, until he finds out that his new sister is actually his school's strict PE teacher, Shina. With his father going off to live with his new wife, the boy will live with alone with his new sister. In their new life together, the boy finds out that Shina at work is completely different from Shina at home: clumsy, scared of insects, and kind. (Source: ANN)
What people say
Community consensus
Derived from 3 sampled reviews
7.0
/10
What 3 readers settled on.
100%
recommend
Score distribution
median 7
mode 6
σ 0.82
Agreement
Strong agreement
σ 0.82 · scores cluster tight
The polarity gap
—
Not enough recommend signal yet
Score over time
↓ 1.00
Running avg · Mar 2021 → Feb 2026
Snap verdicts
· shortest highly-rated reviews
- 8 “This review contains spoilers Well let's start with That Demonic Teacher Will Be My Sister ?. Currently the manga has 8 chapters, and tells us the day to day of a young man with a high level of...”
- 7 “The manga is about a sports teacher that is now our male protagonist's step sister. At school mean teacher mode, at home happy big sister mode. While a typical premise it has more to it than that....”
- 6 “I must say that I have mixed feelings. The first time I read this was two years ago, and at the time I would have given it an 8. I liked the story, although it was also very fast-paced, but now I...”
Verbosity
Short · 33%
Medium · 33%
Long · 33%
Read Order & Related
Explore the Ano Oni Kyoushi ga Boku no Ane ni Naru n desu ka? universe
Cast
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A Manga Publication
- Format 23 × 3 ch × vol
- Total read 3h 04m approx
- Published Aug 2020 – Jul 2022
- Source Manga media type
- Ref. BS-M55278 catalog