Ima wa Mada "Osananajimi no Imouto" desu kedo.

Touki Futahara is about to shake up the everyday routine of Iori Fuyutsuki. As the younger sister of his childhood friend, she has always lingered on the edges of his life, but now she is set to enroll at his high school as an incoming student. She introduces herself as a self-proclaimed "little devil"—the girl most envied by the upperclassmen—and she wastes no time putting that bold persona on full display. Every morning, Touki appears at Iori's door, her voice cutting through the early quiet: "Senpai! Give me your hand! Let's hold hands so we stay warm!" Her brazen demands and playful teasing paint the picture of a girl utterly in control, one who flusters her senior without a moment's hesitation. Iori, however, knows the truth. Beneath the devilish act, Touki is far closer to a shy puppy—someone who turns bright red at even the slightest touch. Every confident remark and every mischievous grin is pure performance, a careful mask hiding just how nervous she really feels inside. The real question is how long she can keep the act up.