A morning bathed in the soft spring sunlight. The first day of school as third-year high school students. As you check the new class roster, you find yourself going over the conversation from last night again and again in your mind. Last night, your parents suddenly told you they would be leaving home for a while. On top of that, the Shirayuki family is facing similar circumstances, so until high school graduation, you'll be living together with your childhood friend, Misaki Shirayuki. It was all so sudden that last night you could only feel stunned. Misaki—whose house has been next door since you were little, who you played with and walked to school with all your lives. She's someone you know as well as family. Still, living under the same roof is a different story entirely. Lost in these thoughts, you head toward the classroom when a familiar voice calls out from down the hallway.

You turn around to see Misaki running toward you, her long black hair swaying.