Uza Kawaikute Nani ga Warui!

Annoying her older brother's best friend, Akiteru, isn't just a hobby for Iroha Kohinata — it's a personal mission, and she's committed to it fully. She's loud, she's clingy, she's always in his face, and she knows exactly what she's doing. That's the entire vibe of this animated music video for the opening theme of "My Friend's Little Sister Has It In for Me," performed by Karubi Akami. It's a single track, not a full series, but as a condensed shot of the uzakawa dynamic — where someone is simultaneously the most irritating and most endearing person in your life — it does a lot with its runtime. The animation is fast, colorful, and expressive, bouncing between school life scenes and stylized sequences that capture the push-and-pull energy between the two leads. Karubi Akami's song is genuinely catchy in a way that sticks with you after one listen, which is kind of the point for an OP theme. If you're into the teasing-romance thing from shows like Teasing Master Takagi-san or Don't Toy with Me, Miss Nagatoro, this hits the same notes but compressed into music video form. It also shares DNA with Uzaki-chan Wants to Hang Out in how it leans into the "she's annoying but you get why he can't just walk away" tension. Worth checking out if you want a quick, well-animated introduction to that whole dynamic before the main series drops.