Mahiro
Oyama is a hikikomori who spends his time playing erotic video games.
Since he has not left the house in years, his sister, Mihari, worries
about his health and intends to bring him back to normalcy. To reach her
goal, Mihari creates a medicine that transforms her brother into a
girl. Mahiro is now forced to live as a female until the effect wears
off.¹
Sexual Content
As
listed on Crunchyroll, this anime contains sexual imagery and
suggestive dialogue.² According to IMDb, there are sounds from Mahiro's
games that are sexual in nature.³ Additionally, characters are seen in
various states of undress, including complete nudity (though not
depicted in detail).³ There are several instances where characters are
in either baths or hot springs.³
This show is immodest, as the above items reveal. What does the Lord think about immodesty and nakedness?
"In like manner also, that women adorn themselves in modest apparel, with shamefacedness and sobriety; not with broided hair, or gold, or pearls, or costly array;" (1 Timothy 2:9)
Even
if we only focus on female immodesty, God has clearly and explicitly
forbidden it. Why, then, would we find it acceptable to fill our minds
with this nakedness and sexual content?
Gender-Swapping
At
the start of the anime, Mahiro is a man, but his sister drugs him,
turning him into a female. Regardless of his depraved lifestyle, his
sister was wrong. God made male and female. He made men and women how He
wanted. To try and change someone's biological sex is against the
gender divide the Lord has established.
This
directly supports transvestism and transgenderism. Mahiro is a man, yet he is biologically changed into a female, and then dresses in female
clothing.
"The woman shall not wear that which pertaineth unto a man, neither shall a man put on a woman's garment: for all that do so are abomination unto the LORD thy God." (Deuteronomy 22:5)
Mahiro
wears a long skirt in his school uniform, but long skirts don't help if
you're not supposed to be wearing a skirt to begin with! By the time
you get to the end of the anime, the drug begins to wear off, returning
various parts of Mahiro to their original, masculine state. However, he
chooses to take the drug again, to make himself female for another
while.⁴
"In the middle of playing with his friends at the pool, Mahiro's drug
slowly wears off and his [flesh] grows back. Without anyone noticing it,
he storms back to the hotel room with Mihari who presents him with a
backup potion, telling him to consider that it will make him stay female
for 'a long time' if taken. After taking the evening's time to reflect
on it, he decides to drink it."⁴
Mahiro goes from involuntarily gender-swapped to choosing to
become a girl! Wikipedia says, "On the way home by train, Mihari
reveals to him that her conspiring rehabilitation project has been
overly successful."⁴ This is framed as something good! The goal was
successful, as if the means were good.
No!
If someone is addicted to pornographic video games, the solution is not
for them to become the opposite sex! The scriptures tell us exactly
what we need to do.
"Flee also youthful lusts: but follow righteousness, faith, charity, peace, with them that call on the Lord out of a pure heart." (2 Timothy 2:22)
Let
me ask you: Is this normal? Mihari wants to bring her brother back into
normalcy, but swapping his sex and him choosing to continue as a female
rather than the male he was born as is not normal!
Lesbianism and Drunkenness
In episode 9, Mahiro's sister, Mihari, drinks, evidently, a low-alcohol 甘酒 (amazake).⁴
She becomes drunk and kisses two other women—Kaede and Miyo, though
only one of these is depicted.⁵ Miyo, prior to the kiss, is "paralyzed
with ecstasy" seeing Mihari kiss Kaede.⁵
Now,
I doubt I need to explain much more. We all know that scripture forbids
drunkenness. In Galatians 5:21, drunkenness is defined as one of the
works of the flesh, not the fruits of the Spirit. This anime is working
against the Spirit!
Regardless of the specific acts performed or not performed by this drink-addled Mihari, she violates the intimacy that should be exclusive to marriage alone with two other girls.
Conclusion
It
is abundantly clear that this anime is not God-honoring. In no way does
the Lord find pleasure in His children watching things He hates. Even
earthly parents get upset when their children watch things that they
have forbidden. How much more the thrice-holy God, Jehovah?
Sources:
1. "Oniichan wa Oshimai!" MyAnimeList, myanimelist.net/anime/51678/Oniichan_wa_Oshimai. Accessed 4/4/2026.
2. ONIMAI: I'm Now Your Sister! Crunchyroll, crunchyroll.com/series/GZJH3D0P5/onimai-im-now-your-sister. Accessed 4/4/2026.
3. "Onimai: I'm Now Your Sister! Parents guide." IMDb, imdb.com/title/tt21929424/parentalguide. Accessed 4/4/2026.
4. "Onimai." Wikipedia, Wikimedia Foundation, 20/1/2026, en.wikipedia.org/wiki/Onimai. Accessed 4/4/2026.
5. "Mahiro and the Spicy Kiss." Onii-chan wa Oshimai! Wiki, oniichan-wa-oshimai.fandom.com/wiki/Mahiro_and_the_Spicy_Kiss. Accessed 4/4/2026.