Ima wa Mada "Osananajimi no Imouto" desu kedo.

Touki Futahara is the younger sister of Iori Fuyutsuki's childhood friend and an incoming student at their high school. She's a self-proclaimed little devil and "the girl most envied by seniors." Now she's waiting at Touki's door every morning. *"Senpai! Give me your hand! Let's hold hands to stay warm!"* But Iori knows that Touki's actually more like a shy puppy who blushes at the slightest touch. All the bold teasing is just an act, and she's feeling nervous inside. (Source: Kadokawa, translated)