Watch Anime Online: My Friend's Little Sister Has It In for Me! (2025)

Get ready for a hilarious romantic comedy! My Friend's Little Sister Has It In for Me! is the anime series that's turning the classic "annoying little sister" trope on its head. When a cynical high schooler tries to avoid all the typical teenage drama, he doesn't anticipate how much chaos one persistent girl can bring into his life. This 2025 anime promises comedy, charm, and plenty of awkward moments that'll keep you entertained through all 12 episodes.

Plot Summary: What's the Story?

Akiteru Oboshi has made a decision: high school romance, friendships, and fun are simply not worth his time. But his plans for a drama-free existence take a sharp turn when Iroha Kohinata—his best friend's younger sister—decides she's going to make his life as complicated as possible. With her constant teasing, her habit of appearing in his room uninvited, and her relentless clinginess, Iroha is determined to break through his apathetic exterior. The question isn't whether she'll succeed, but how much chaos she'll create in the process.

Release Date & Episode Guide

My Friend's Little Sister Has It In for Me! premiered on October 4, 2025. The anime series runs for 1 complete season with 12 episodes, each episode clocking in at 23 minutes. The series has concluded, so fans can enjoy the full story from start to finish.

Full Cast & Voice Actors

This comedy anime features a talented voice cast bringing the characters to life: Haruki Ishiya, Sayumi Suzushiro, Tomori Kusunoki, Soma Saito, and Kana Hanazawa lead the ensemble, delivering performances that capture both the humor and heart of this romantic comedy series.

Production Details

• Animation Studio: BLADE, NK Animation, Asmik Ace
• Networks: HTB, TV Asahi, Nagoya TV
• Production Country: Japan
• Genre: Animation, Comedy, Romance
• Series Type: Anime Series
• User Rating: 7.588/10

Where to Watch Online

Interested in watching My Friend's Little Sister Has It In for Me! online? Streaming availability information will be updated as official licensing details are finalized. Be sure to bookmark this page for the latest updates on where you can stream this anime series legally.

Stay tuned for streaming announcements! We'll keep you informed as soon as official platforms confirm their broadcast schedules.

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