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

Akiteru Oboshi, a high school student, views the typical experiences of youth—fun, friendships, and romance—as pointless distractions. So when his best friend's sister, Iroha Kohinata, relentlessly teases him, he can't help but feel irritated. She seems to invade his space constantly, often lounging on his bed, embodying a whirlwind of clinginess. It drives him crazy that she only acts this way when she's around him!