Ima wa Mada "Osananajimi no Imouto" desu kedo.

Touki Futahara is the younger sister of Iori Fuyutsuki's childhood friend and is about to start high school with them. She calls herself a mischievous "little devil" and claims to be the most envied student by upperclassmen. Each morning, she waits at Touki's door and asks for his hand to keep warm. Iori, however, understands that Touki is actually shy and easily flustered by physical contact. Her confident and playful behavior is a facade, masking her inner anxiety.