Dumped on Christmas Eve, Natsuki Hashiba is crying in the street when a girl in a Santa suit hands him a tissue, and he falls for her on the spot. She turns out to be Anna Kobayakawa, a classmate from another section, and the scarf he had bought for his ex ends up in her hands. Natsuki sets out to win her over with the loud, unsolicited help of his three best friends: the laid-back Tomoya Matsunaga, the level-headed Keiichi Katakura and the sharp-tongued Tsuyoshi Naoe.