My Friend's Little Sister Has It In for Me!

8.8

For high schooler Akiteru Oboshi, the whole youthful experience thing—like fun, friendships, and even having a girlfriend—is a complete waste of time. So when his best friend’s sister, Iroha Kohinata, keeps teasing him, Akiteru naturally finds it annoying. She practically lives in his room, she’s always on his bed, she’s just a raging storm of clinginess! Why is she only annoying around him?!

Production

Production

Trailers & Videos

Thumbnail for video: Official Trailer [Subtitled]

Official Trailer [Subtitled]

Seasons

12 Episodes • Premiered 2025

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 1: My Friend's Little Sister Has It In for Me

1. My Friend's Little Sister Has It In for Me

8.5

Akiteru just wants to work toward his future, but his friend's little sister won't allow him any peace.

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 2: The Cousin I Haven't Seen in Years Is Cold to Me

2. The Cousin I Haven't Seen in Years Is Cold to Me

8.5

Now that Mashiro has moved to his school, can Akiteru manage to make her open up to him?

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 3: Only I Can Be a Pain to My Uncle’s Daughter

3. Only I Can Be a Pain to My Uncle’s Daughter

8.0

Akiteru decides to throw a welcome party for Mashiro, but first he must convince her to attend.

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 4: My Friend's Little Sister Might Be a Delinquent

4. My Friend's Little Sister Might Be a Delinquent

8.0

Akiteru and Iroha recall how they first met.

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 5: My Friend's Little Sister Keeps Getting Close to Me

5. My Friend's Little Sister Keeps Getting Close to Me

8.0

A look back at how Iroha came to be the voice actress for 05th Floor Alliance.

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 6: My Friend's Little Sister Has It In for My Friend's Enemy

6. My Friend's Little Sister Has It In for My Friend's Enemy

8.0

While at the mall with Mashiro and Iroha, Akiteru learns why Mashiro left her old school.

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 7: The Girl Who Confessed to Me Is Cold to Me in Reality

7. The Girl Who Confessed to Me Is Cold to Me in Reality

Akiteru tries to give a proper reply to Mashiro's love confession, but she's brutally cold to him in person.

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 8: Everyone I Know Is Being Weird With Me

8. Everyone I Know Is Being Weird With Me

Sumire asks Akiteru for help with a problem that could endanger her future with 05th Floor Alliance.

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 9: Episode 9

9. Episode 9

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 10: Episode 10

10. Episode 10

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 11: Episode 11

11. Episode 11

Still image for My Friend's Little Sister Has It In for Me! season 1 episode 12: Episode 12

12. Episode 12

Cast

Photo of Haruki Ishiya

Haruki Ishiya

Akiteru Oboshi (voice)

Photo of Sayumi Suzushiro

Sayumi Suzushiro

Iroha Kohinata (voice)

Photo of Tomori Kusunoki

Tomori Kusunoki

Mashiro Tsukinomori (voice)

Photo of Soma Saito

Soma Saito

Ozuma Kohinata (voice)

Photo of Kana Hanazawa

Kana Hanazawa

Sumire Kageishi (voice)

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