Tomodachi no Imouto ga Ore ni dake Uzai (My Friend’s Little Sister Has It in for Me!) is a romantic comedy that follows Akiteru Ooboshi, a seemingly average high schooler who keeps a cool, dependable facade while secretly struggling with his own insecurities. His life takes a chaotic turn thanks to Iroha Kohinata, the lively and mischievous younger sister of his best friend, who teases and meddles with him at every opportunity. Though their constant back-and-forth feels like playful antagonism, Iroha’s relentless energy gradually pushes Akiteru to open up and confront his true feelings. Blending sharp humor, youthful banter, and tender moments, the series explores the messy yet heartfelt path of love hidden beneath everyday teasing.